The function of the heart is to provide oxygen and ...



Blood Flow through the Heart

Your circulatory system is like a delivery service. It runs throughout every part of your body, carrying to your cells everything they need, and carrying away everything they don’t need.

Heart contains 4 chambers:

- The upper two are called the right and left atrium.

- The lower two are called the right and left ventricles.

(These chambers relax and expand to let blood flow into them. Then they contract to push blood out.)

* Arteries carry blood away from the heart.

* Veins carry blood to the heart.

* Capillaries connect arteries and veins.

The function of the heart is to provide oxygen and nutrients to your tissues and to remove waste.

Step 1:

Blood returning to the heart from the body enters the right atrium.

Step 2:

Blood flows and is pumped from the right atrium across the open tricuspid valve into the right ventricle.

Step 3:

The right ventricle contracts (the tricuspid valve closes) and the pulmonary valve opens and blood pumped into the pulmonary arteries.

Step 4:

The pulmonary arteries carry blood to the lungs to be oxygenated.

Step 5:

Oxygenated blood is returned to the heart by pulmonary veins.

Step 6:

This oxygenated blood returns to the heart by pulmonary veins and enters the left atrium.

Step 7:

Blood from the left atrium flows across an open mitral valve to enter the left ventricle.

Step 8:

As the left ventricle starts to contract the mitral valve closes and aortic valve opens to pump blood into the aorta.

Step 9:

The aorta and arteries that branch from it carry blood to the entire body.

• The left ventricle is the largest and most forcefully contracting chamber of the heart. It must pumps oxygen rich blood to the whole body.

1. Body via veins

2. Right Atrium

3. Tricuspid Valve

4. Right Ventricle

5. Pulmonary Valve

6. Pulmonary Arteries

7. Lungs to be oxygenated

8. Pulmonary Veins (back to heart)

9. Left Atrium

10. Mitral Valve

11. Left Ventricle

12. Aortic Valve

13. Aorta

14. To the Rest of the Body

15. Optional Capillaries

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