A labelled diagram of the human heart with a detailed human heart diagram.

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A labelled diagram of the human heart

Below is a labelled diagram of the human heart with a detailed heart diagram. This shows the inside of a normal, healthy, human heart.

The human heart diagram shows a cross-section of a healthy heart and its inside structures. The blue arrow shows the direction in which oxygen-depleted blood flows from the body to the lungs. The red arrow shows the direction in which oxygen-enriched blood flows from the lungs, supplying oxygen to the rest of the body.

Heart Chambers
The human heart diagram shows the inside of our heart and how it's divided into four chambers. The two upper chambers of our heart are called atria. The atria receive and collect blood.
The two lower chambers of our heart are called ventricles. The ventricles pump blood out of our heart into the circulatory system to other parts of our body.

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

A labelled diagram of the human heart with a detailed human heart diagram.

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Heart Valves
The human heart diagram shows our heart's four valves. Shown counter clockwise in the picture, the valves include the aortic valve, the tricuspid valve, the pulmonary valve, and the mitral valve.

Blood Flow
The arrows in the human heart diagram show the direction that blood flows through the heart. The light blue arrows show that blood enters the right atrium of the heart from the superior and inferior vena cavae. From the right atrium, blood is pumped into the right ventricle.

From the right ventricle, blood is pumped to our lungs through the pulmonary arteries. The light red arrows show the oxygen-enriched blood coming in from our lungs through the pulmonary veins into the heart's left atrium. From the left atrium, the blood is pumped into the left ventricle. The left ventricle pumps the blood to the rest of our body through the aorta.

For the heart to work properly, our blood must flow in only one direction. The heart's valves make this possible. Both of our heart's ventricles have an "in" (inlet) valve from the atria and an "out" (outlet) valve leading to our arteries. Healthy valves open and close in very exact coordination with the pumping action of our heart's atria and ventricles. Each valve has a set of flaps called leaflets or cusps that seal or open the valves. This allows pumped blood to pass through the chambers and into our arteries without backing up or flowing backward.

End of detailed diagram of the human heart with a human heart interior diagram.

 

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