Heart Diagram with Blood Flow

How the Heart Works: Blood Flow Diagram
How Blood Flows Through a Healthy Heart

This diagram shows how blood flows through a healthy heart.





 

Left Side of the Heart
The blood coming from the lungs to the heart collects in the Left Atrium, filling it up. This initiates a contraction of the walls of the Left Atrium forcing the Mitral Valve to open as the blood gushes into the Left Ventricle.

The Left Ventricle fills with blood which forces the Mitral Valve to close and initiates the muscle of the Left Ventricle to contract, open the Aortic Valve, and squeeze the blood through the Aortic Valve and on to the body.

The blood coming out of the Left Ventricle to the Aorta is under high pressure. This pressure is enough to rush it to the different parts of the body at high velocity and give its oxygen and nutrients to the body tissues. The blood comes back from the body to the right side of the heart.

 

Right Side of the Heart
The blood coming from the body to the heart collects in the Right Atrium, filling it up. This initiates a contraction of the walls of the Right Atrium forcing the Tricuspid Valve to open as the blood gushes to the Right Ventricle.

The Right Ventricle fills with blood which forces the Tricuspid Valve to close and initiates the muscle of the Right Ventricle to contract, open the Pulmonic Valve and squeeze the blood through the Pulmonic Valve and on to the lungs.

This blood will replenish itself with more oxygen and get rid of the carbon dioxide and return to the left side of the heart to begin another cycle.




label diagram to label

aorta - the biggest and longest artery (a blood vessel carrying blood away from the heart) in the body. It carries oxygen-rich blood from the left ventricle of the heart to the body.
inferior vena cava
- a large vein (a blood vessel carrying blood to the heart) that carries oxygen-poor blood to the right atrium from the lower half of the body.
left atrium
- the left upper chamber of the heart. It receives oxygen-rich blood from the lungs via the pulmonary vein.
left ventricle
- the left lower chamber of the heart. It pumps the blood into the aorta.
mitral valve
- the valve between the left atrium and the left ventricle. It prevents the back-flow of blood from the ventricle to the atrium.
pulmonary artery
- the blood vessel that carries oxygen-poor blood from the right ventricle of the heart to the lungs.
pulmonary valve - the flaps between the right ventricle and the pulmonary artery. When the ventricle contracts, the valve opens, causing blood to rush into the pulmonary artery. When the ventricle relaxes, the valves close, preventing the back-flow of blood from the pulmonary artery to the right atrium.
pulmonary vein
- the blood vessel that carries oxygen-rich blood from the lungs to the left atrium of the heart.
right atrium
- the right upper chamber of the heart. It receives oxygen-poor blood from the body through the inferior vena cava and the superior vena cava.
right ventricle
- the right lower chamber of the heart. It pumps the blood into the pulmonary artery.
septum
- the muscular wall that separates the left and right sides of the heart.
superior vena cava
- a large vein that carries oxygen-poor blood to the right atrium from the upper parts of the body.
tricuspid valve
- the flaps between the right atrium and the right ventricle. It is composed of three leaf-like parts and prevents the back-flow of blood from the ventricle to the atrium.


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