How Does Blood Flow Through The Heart?

Armen Hareyan's picture
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The right and left sides of the heart work together.

Right Side of The Heart

Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium.

Atrial contraction: blood flows from your right atrium into your right ventricle through the open tricuspid valve.

When the ventricles are full, the tricuspid valve shuts. This prevents blood from flowing backward into the atria while the ventricles contract (squeeze).

Ventricular contraction: blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs.

Left Side of The Heart

The pulmonary vein empties oxygen-rich blood, from the lungs into the left atrium.

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Atrial contraction: blood flows from your left atrium into your left ventricle through the open mitral valve.

When the ventricles are full, the mitral valve shuts. This prevents blood from flowing backward into the atria while the ventricles contract (squeeze).

Ventricular contraction: blood leaves the heart through the aortic valve, into the aorta and to the body.

This pattern is repeated over and over, causing blood to flow continuously to the heart, lungs and body.

How does blood flow through your lungs?

Once blood travels through the pulmonic valve, it enters your lungs. This is called the pulmonary circulation. From your pulmonic valve, blood travels to the pulmonary artery to tiny capillary vessels in the lungs. Here, oxygen travels from the tiny air sacs in the lungs, through the walls of the capillaries, into the blood. At the same time, carbon dioxide, a waste product of metabolism, passes from the blood into the air sacs. Carbon dioxide leaves the body when you exhale. Once the blood is purified and oxygenated, it travels back to the left atrium through the pulmonary veins.

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Comments

Everyone who looks at this website is probably asking, " Umm.... What is the flow of the body called?" because that is what I am asking in this comment! Please update and tell us what it is called! Althought this doesnt help me with the name the rest was very helpful! Thanx! anyonamouse
It's called the circulatory system. Is that what you are asking?
wow! just what i needed! thanks
Thanks! Very helpful!
wow our blood is important to our body
This is awesome. It really helped me on understanding the travel of blood!
this info is just awesome....................