Question

How does blood flow through the circulatory system?

Answer 1

Circulatory system:

1. The circulatory system consists of arteries and veins that transport blood to the heart and supply other parts of the body.
2. The heart is the primary pumping organ, sending deoxygenated blood to the lungs and oxygenated blood to the rest of the body.

Blood circulation:

1. The superior and inferior vena cava carry deoxygenated blood from all over the body to the right atrium.
2. The atrium contracts and blood flows from the atrium to the right ventricle via the tricuspid valve, which controls blood flow.
3. When the ventricles contract, blood flows through the pulmonic valve to the pulmonary artery, which transports blood to the lung for oxygenation.
4. The oxygen-rich blood is then returned to the heart via the pulmonary vein to the left atrium.
5. The left atrium contracts, and blood from the atrium flows to the left ventricle via the mitral valve, preventing blood backflow.
6. Further ventricles contract and oxygenated blood is transported from the heart to all parts of the body via the aorta and arteries.
7. An aortic valve protects the aorta.