Human heart diagram, anatomy, picture, valves & arteries

heart diagram

Heart diagram help to detect the different part of the heart and also help to identify the size, shape and location of heart. It is one of the major and vital organs in our body. We can learn about all parts of heart by using a single human heart diagram. The heart muscle is very special as it pumps blood around our body. Normally the blood provides or serves our body with nutrient and oxygen. If something is wrong with our heart, then it can affect the other parts of our body.

Human heart diagram

Human heart diagram helps to identify different organ into heart. Human heart is major organ in the human body. Heart plays an important rule and its function is truly fascinating. Human heart performs highly specific function although it is small in size. Diagrams of the human heart are help to identify different organ into heart. The article human heart diagram and short description on each part of the human heart are given below:

blood vessels in the human heart diagram:

In general sense, usually a vessel is defined as hollow instrument for carrying something like a cup or a tube or bucket. Blood vessels are hollow toots or tube for carrying blood and it located throughout the body. The human heart blood vessels are hollow tube that circulates the blood.

There are 3 varieties of blood vessel in the human heart blood vessels: those are arteries, veins and capillaries. Normally the arteries carry blood away from the human heart during blood circulation. The blood capillaries are connected to the arteries to veins and finally the veins carry the blood back into the human heart.

If you took all of the human blood vessels out of an average kids, and then it laid in one line, the blood vessel line would be 60,000 miles long, an and adults blood vessels would be more than 90,000 miles.

Besides circulating blood, blood vessels normally provide 2 important means of measuring major health statistics: those are blood pressure and pulse. We usually measure pulse or heart rate by touching an artery. Normally the rhythmic contraction of the blood artery keeps velocity with the beat of the human heart. An artery is near to the surface of the skin, on the other hand the heart is deeply protected and we can easily touch the blood artery and find an exact measure of the human heart pulse.

Atria and Ventricles in the human heart diagram:

In the human heart diagram it is monitor that the heart comprise four chambers, those are right atrium, left atrium, right ventricle and left ventricle. The two upper chambers are called the left and the right atria, and the two lower chambers are known as the left and the right ventricles. In the human heart diagram two atria and ventricles are separated from each other by a muscle wall called ‘septum’. The septum separates the ventricles from each other, and can be seen in the labeled heart diagram.

Heart diagram

Heart diagram is the outlook figure of heart. The human heart is situated under the ribcage. Its major function is pumping blood continually, muscular wall beat or contraction and blood pumping to all the parts of the body. There are two sides of human heart; these are left and right side. Both of the sides act as blood pumping. In human heart diagram the two sides are again divided into two chambers and four chambers in total. In heart diagram upper chamber are normally called ARTRIA and they collect blood. In heart diagram lower chambers are called VENTRICLES and they there function is contract to pump the blood our.

Size and location of human heart

Human heart is located under the ribcage into the center of our chest between our right and left lungs. The heart muscular walls generally beat or contract and pumping blood continually to all the parts of our body in human heart diagram. The size of heart can little bit very that depends on your age, size and also the condition of our heart. Normally the healthy person’s heart is little bit larger than the slim persons. On the other hand some disease of heart can causes the heart to become larger.

Why does the heart pump blood?

The left side of our heart is larger than the right side heart. The left side of the heart pumps bloods that rich in nutrient and oxygen, through the blood vessels to the head and other part of our body. The oxygen is then used by the body and then our vain carry the blood into right side of our heart, which is low in oxygen. The right side of our heart the pump this low oxygenates blood into the lung when it receives more oxygen. This high oxygenates blood the returns into the left side of our heart and again it pumped into the whole part of our body. Normally the blood is pumped at very high pressure; as a result it can reach all the part of our body. For this to occur the heart has to be very much strong and also needs a very good blood supply? This is generally provided by coronary arteries.

heart diagram

heart diagram

The coronary arteries in human heart diagram

In heart diagram the coronary arteries is branch off the aorta. The coronary arteries is the main artery that taking blood away from the heart into the rest of the human body. In human heart diagram the coronary arteries are the first to accept the blood that is reach is oxygen. Normally the two coronary arteries are passing around the human heart and meet at the back and it almost forms a circle. Generally the left coronary arteries and its branches deliver blood to most of the lower chambers or left ventricle. The left ventricle is larger and muscular of the two ventricles. The right coronary artery normally supplies the right ventricle and also the underside of the heart in human heart diagram.

Labeled human heart diagram

Normally heart located under the ribcage in the center of chest between right and left lungs. The main function of heart is pumping blood continuously to all part of body. The adult heart pumps about 1,500 to 2,000 gallons per day. The heart size is depending on age, size and the condition of heart. Sometime heart becomes large due to some disease.

The human heart diagram resembles the shape of an upside-down pear, weighing between 7-15 ounces, and is little larger than the size of the fist. Heart enclosed in a bag like structure that called the pericardium. It is located between the lungs, and that are in the middle side of chest. Human heart is one of the most vital organs. Human heart pumps blood and distributed all the body. Per minute normally human heart beat approximately 70-72 time. Human heart pump oxygenated blood all the body. Observing the human heart diagram it will help to comprehend the different parts of the human heart.

The human heart

The human heart is one of the most essential organs in the whole human body. The human heart is really nothing more than a blood pump, composed of muscle that pumps blood throughout the entire body and beating approximately 73 times per minutes. The heart pumps the blood that carries all the important material which helps our bodies function. It also removes the waste chemical that we do not need anymore. For example, brain requires glucose and oxygen, which, if not accepted continuously, will cause it to lose consciousness. Normally muscles need glucose, amino acid and oxygen, as well as the appropriate ratio of calcium, potassium and sodium salts in order to contract generally. The gland needs adequate supplies of raw materials from which to produce the specific secretions. If the human heart ever stops to pump blood in the body, then the body begins to shut down and after a short period of time the person will die.

The conduction system of heart

The human heart has its own electric system. The conduction system allows impulses to passes through the heart muscles and causing them to contract and also pumps blood around the whole body. Normally the electrical impulse is generated by a special part of the atrium which called the sinus node. This is commonly called the heart natural pacemaker in human heart diagram. The electrical impulse generally travels from the sinus node through the muscle to the atriums and causing them to contract and also push the blood in the ventricles. Then the impulse comes to the   atrium-ventricular node. The atrium-ventricular node acts like a junction box and delaying the impulse temporarily before it enters the muscle of ventricles via fibers. As the impulse is travel alone these fibres, the ventricles both are contract and pushing the blood out from the heart into the lung and body. Generally these impulses make the heart beat 50-70 times in every minute.

heart diagram

heart diagram

Anatomy of the Heart

The different parts of heart in heart diagram are discussed below:

The exterior of heart in human heart diagram

Below is an image of the outside of a normal, healthy human heart diagram.

The heart is the muscle into the lower half of the image of human heart diagram. The heart has four chambers and the right left atria are shown in purple color into heart diagram. The left and right ventricles are shown in red color into heart diagram. Some of the mail blood vessel like arteries and veins, which normally make up our blood circulatory system and those, are directly connected to the heart.

On the other hand the ventricle on the right side of our heart pumps blood from our heart to lungs. When our breathe air in, then oxygen passes from our lung through our blood vessel and our blood. Carbon dioxide and waste product are passes from our blood through the blood vessel into our lung and are eliminated from our body when we breathe out in human heart diagram.

The left atrium normally receives oxygen rich blood from our lungs. The pumping action of our left ventricle sends this oxygenates or oxygen rich blood through the aorta to the rest of our body.

human heart diagram

human heart diagram

The right side of heart in human heart diagram

The superior and inferior vena cava is in blue color in heart diagram to the left of the heart muscle as you seem at the heart picture. These veins are major and largest veins in our body. After our body’s tissue and organs have use the oxygen in our blood, and then the vena cava carry the oxygen poor blood back into the right atrium of our heart in human heart diagram.

The superior vena cava are carries oxygen poor blood from the upper parts of our body, including arms, chest, neck and head. The inferior vena cava are carries oxygen poor blood from the lower parts of our body. The oxygen poor blood from vena cava flows into our hearts right atrium and on to the right ventricle. Then from the right ventricle, then blood is normally pumped through the pulmonary arteries to our lung.

The left side of heart in human heart diagram

The oxygen rich blood from our lungs passes through the pulmonary vein that indicates in red to the right of the left atrium in human heart diagram. It enters the left atrium and is also pumped in the left ventricle. From left ventricle, oxygenate or the oxygen rich blood is normally pumped to the rest of the body through the aorta in human heart diagram.

Like all of our organs, our heart needs blood rich with oxygen and this oxygen is supplied through the coronary arteries as the blood is pumped out of our hearts left ventricle. Our coronary arteries are normally located on our hearts surface at the beginning of aorta. Our coronary arteries (shown in red in heart diagram) carry oxygen rich blood to all the parts of our heart in human heart diagram.


The heart sits within a fluid filled cavity, which called pericardial cavity. The walls and the lining of pericardial cavity are a particular membrane known as pericardium. The pericardium is types of serous membrane which produces serous fluid to lubricate the heart and also prevent friction between the ever beating heart and also its surrounding organs. The pericardium has two layers. One is visceral layer which covers the outside portion of the heart and another is parietal layer that normally forms a sac around the outer portion of the pericardial cavity in human heart diagram.

heart diagram

heart diagram

Structure of heart wall in human heart diagram

In the structure of human heart diagram it is shown that the heart wall is made of three layers:


The epicardium is one of the most outer layers of the heart wall and is another name for the visceral layer of the pericardium. The epicardium is normally a thin layer of serous membrane which helps to lubricate and also protect the outer side of the heart in human heart diagram. Under the epicardium is another thicker layer of the heart wall that called myocardium in human heart diagram.


The myocardium is muscular middle layer of heart wall which contain the cardiac muscle tissue. Normally the myocardium makes up the majority of the mass and the thickness of the heart wall. It is the part of the heart which responsible for pumping blood. Under the myocardium is present thin endocardium layer.


It is the simple squamous endothelium layer which lines the inside of the human heart. Normally the endocardium is very smooth and it also responsible for keeping blood from the sticking into the inside of the heart and also forming potentially deadly blood cloth.

heart diagram

heart diagram

The interior of the heart in human heart diagram

Below is a picture of the inside of a healthy, normal human heart diagram:

The septum

The left and right sides of our heart are divided by an internal wall of tissue that is called the septum. The part or area of the septum that divides the atria (it is two upper chamber of our heart) are called the interatrial or atrial septum. The area of the septum divides the ventricle (it is two lower chamber of our heart) is called the interventricular or ventricular septum.

Chambers of the Heart

The heart contains four chambers that shown in above human heart diagram. These are:

  1. The right atrium.
  2. Left atrium.
  3. Right ventricle.
  4. And left ventricle.

The function of all heart chambers in human heart diagram are given below:

  1. The right atrium usually receives blood from the veins and also pumps it to the right ventricle.
  2. The left atrium accept oxygenated blood from the lings and also pumps it into the left ventricle in human heart diagram.
  3. The right ventricle receives the blood from the right atrium and also pumps it into the lungs and there it is loaded with oxygen.
  4. The left ventricle which is very strongest chamber, pumps oxygen rich blood into the rest of the human body. Normally the ventricle’s vigorous contractions create blood pressure in human heart diagram.

The heart valves in human heart diagram

In human heart diagram it is shown that the four valves regulate the blood flow through our heart:

  1. The tricuspid valve that regulates the blood flow between the right ventricle and right atrium in human heart diagram.
  2. The pulmonary valve that controls blood flow from right ventricle to the pulmonary arteries, which carry blood into our lung to pick up oxygen.
  3. The mitral valve lets the oxygen rich blood from our lung pass from the left atrium into left ventricle in human heart diagram.
  4. The aortic valve opens the system for oxygen rich blood to pass from the left ventricle to the aorta, our body’s largest artery; there it is delivered to the rest of our body.
heart diagram

heart diagram

Heart valve problems

Heart valve problems are sometime called valvular heart problems and it can strain the heart. The heart has to work so harder to balance for the damage valve and this condition can weaken the heart and also increase the risk to develop heart failure or sudden cardiac arrest. Normally heart valve problems can also raise the risk of blood clots that can cause stroke.

Some heart valve problems are not possible to detect or identify because they do not cause any symptoms to identify this problems. But according to USA heart association, about five million Americans in every year learn that they have heart valve problems. Normally heart valve problems often get into worse after showing the symptoms. If it turns out that the symptoms are signaling a heart valve problems, then doctor will want to observe you on a usual basis to examine your condition. If heart valve problems become severe, then it must require treatment, such as surgery, medication or any other clinical procedure to replace or repair the heart valve.

Symptoms of heart valve problems

Major symptoms of heart valve problems are including:

  1. Shortness of breath.
  2. Difficulty to catching your breath during normal activities or during lying into bed.
  3. Dizziness or weakness.
  4. Fainting or passing out.
  5. Chest discomfort when stepping out in the cold.
  6. Abdominal pain because of enlarged liver.
  7. High or low blood pressure.
  8. Heart palpitation.
  9. Swollen feet and ankles or swelling in the abdomen.
  10. Sudden weight gain.

The circulatory system in human heart diagram

Blood vessel

There are three types of blood vessel including:


  1. Carry blood away from the heart and always oxygenated blood from the pulmonary artery into the lung.
  2. Have a thick muscular wall.
  3. Have a small passageway for blood.
  4. Contain blood under the high pressure.


  1. That carries blood into the heart and always DE-oxygenated apart from the pulmonary vein that goes from the lung into heart.
  2. Have a thin wall.
  3. Have a larger internal lumen.
  4. It contains blood under low pressure.
  5. Have valves to prevent the blood flowing backward.


  1. Found in the lungs and muscle.
  2. Microscopic- one cell thick.
  3. Very low blood pressure.
  4. Where gas exchange take place.

The heart beat

A heartbeat is usually two part pumping action which takes about a second. In heart diagram blood collects into the right and left atria or upper chamber, the hearts natural pacemaker sends out an electrical signal which causes the atria to contract. Then this contraction pushes blood through the mitral valves and tricuspid into the right and left ventricles or resting lower chamber. This part of the two part pumping phase is called diastole.

On the other hand the second part of the blood pumping phase start when the ventricles are filled with blood. Electrical signal from the sinus node is travel along a pathway of cells into the ventricles, and causing then to contract. This is called systole. The tricuspid and mitral valves lock tightly to prevent a back flow of blood, and the aortic and pulmonary valves are pushed open. While the blood is pushed from the right ventricle to the lung to pick up oxygen, the oxygenate blood or oxygen rich blood flows from the left ventricle into the heart and also other part of the body.

heart diagram

heart diagram

The cardiac cycle

The cardiac cycle includes every part of the events which take place during a single heartbeat. There are three phases to the cardiac cycle, those are:

  1. Atrial systole.
  2. Ventricular systole.
  3. And relaxation.

Atrial systole

During the atrial systole phase of the cardiac cycle, normally the atria contract and also push blood in the ventricles. To make facilitate this filling, the AV valves are stay open and also the semilunar valves stay closed or off to keep arterial blood from re entering into the heart. Normally the atria are much lesser or smaller then the ventricles, as a result they only fill about twenty five percent of the ventricle during this phases and the ventricle stay in diastole during this phase.

Ventricular systole

During the ventricular systole, the ventricles normally contract to push blood into the aorta and also pulmonary trunk. Then the pressure of the ventricle are force the seminular valves to open and AV valves to close or off. These arrangements of valves are allow the blood flow from the ventricular into the arteries. On the other hand the cardiac muscle of the atria repolarizes and also enters the state of the diastole during Ventricular systole phase.

Relaxation phase

During the relaxation phase all four chamber of the heart are in diastole as the blood pours in the heart from the veins. Then the ventricles fill to about seventy five percent capacity during relaxation phase and will be completely filled after the atria enter systole. Then the cardiac muscle cells of the ventricles are repolarize during the phase to prepare for next round of contraction and depolarization. In relaxation phase the AV valves are open or unblock to allow blood to flow liberally into the ventricles.

Heart sound

The sounds of a normal heartbeat are known as “dupp” and “lubb” and are normally caused by blood pushing into the valves of the heart. Normally the “lubb” sound comes first in the heartbeat and also is the longer between two hearts sound. The “lubb” sound is usually produced by closing of the AV valves during the beginning of the ventricular systole. The sharper, shorter “dupp” sound is similarly caused by closing the semilunar valves at the last end of the ventricular systole. Normally during a normal heartbeat, these hearts sounds repeats in a regular pattern of the lubb-dupp-pause. If any additional sound such as gurgling or liquid rushing and irregular heartbeat indicate a structure problem in the heart.

Heart condition

Coronary artery disease

Over the years, the cholesterol plaques can narrow the arteries supplying blood into the hart. These narrowed arteries are at much higher risk for complete blockage from sudden blood clot. These types of blockage is usually called heart attack.

Myocardial infarction

This condition is also known as heart attack. When a coronary artery is suddenly blocked, then the oxygen become shorter into heart and the heart muscle become dies.


An abnormal heart rhythm is due to the changes in the conduction of electrical impulses through the heart. Normally some arrhythmias are benign, but some other is life-threatening. This condition is also known as dysrhythmia.

Congestive heart failure

The heart is either too much weak or too much stiff to effectively pump the blood through the body. The common symptoms are leg swelling and shortness of breath.


It is a disease of heart muscle in which the heart is abnormally become enlarged, thickened and stiffened. It is one kind of heart disease. As a result the ability of the hearts to pump blood is weakened.


It is one kind of heart disease. As a result the heart muscle becomes inflamed. Most of the time inflammation of heart muscle occurs due to viral infection.

Cardiac arrest

This condition can occur due to sudden loss of heart function. This condition is one kinds of heart failure.

Sudden cardiac death

When death becomes caused due to sudden loss of heart function, this condition is normally reoffered to as sudden cardiac death. This condition is also known as cardiac arrest.

Heart valve disease

It is another heart disease. There are four heart valves, and each can build up problems. If severe, valve disease can cause the congestive heart failure.

Heart murmur

An abnormal heart sound heard when listening to the heart with a help of stethoscope. Several heart murmurs are benign; and others suggest heart disease.

Heart test


This heart test is also known as ECG or EKG. Electrocardiogram is a tracing of the heart’s electrical activity. This heart test can help diagnose many heart conditions.


It is another heart test. Echocardiogram is an ultrasound of the heart. Normally an echocardiogram provides direct viewing or observes of any problems with the heart and heart muscles pumping ability and also heart valves.

Cardiac stress test

It is very important heart test. In this technique using a treadmill or medicines and the heart is stimulated to pump into the near-maximum capacity. By using this technique it is possible to detect coronary artery disease.

Cardiac catheterization

In this technique a catheter is inserted in the femoral artery in the groin and also threaded into the coronary arteries. Then a doctor can then views X-ray images of the coronary arteries or any blockages and also perform stinting or other procedures.

Holter monitor

If a doctor suspects an arrhythmia or heart attack, a portable heart monitor can be damaged. Called a Holter monitor and it records the heart’s rhythm incessantly for a 24 hour period.

Event monitor

If a doctor suspects an infrequent heart attack or arrhythmia, then a portable heart monitor is called an event monitor can be damaged. When you expand symptoms, you can drive a button to record the heart’s electrical rhythm.

All Comments

  • Very detailed post with exact diagram. Helpful for medical student and biochemist.

    Nick Allen January 3, 2017 3:38 pm Reply

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