Explain circulatory system through a diagram.
- Humans have closed circulatory system.
- Heart, arteries, veins and lungs are the major component of the circulatory system.
- The heart has four chambers. Two atria and two ventricles.
- The arteries carry oxygenated blood from the heart to the different parts of the body.
- The deoxygenated blood is returned back to the heart via veins.
- Lungs receive the deoxygenated blood from the heart via pulmonary artery. It oxygenates the blood and returns to the heart by pulmonary veins.
- The right atria receive the deoxygenated blood by the vena cava (collection of veins).
- The atria contracts and pumps the blood to the right ventricle.
- The right ventricle pumps the blood via pulmonary arteries to lungs for oxygenation.
- The oxygenated blood from the lungs moves to the heart via pulmonary veins.
- From pulmonary veins, blood enters in the left atrium and then left ventricle.
- From left ventricle, blood goes to aorta which comes out of the heart and breaks into arterioles and distribute the oxygenated blood to different organs.