What is the function of the heart? The heart is an organ in your body which sends blood to the rest of your body. The blood gives us oxygen (air) and also nutrients that you and I need in order to function.

There are 4 chambers that make up the heart. Those are-

-The right atrium- receives oxygen-poor blood from the body and pumps it to the right ventricle

-The right ventricle -pumps the oxygen-poor blood to the lungs.

-The left atrium- receives oxygen-rich blood from the lungs and pumps it to the left ventricle.

The left ventricle- pumps the oxygen-rich blood to the body.

What is the difference between veins and arteries? Arteries carry oxygenated blood away from the heart to the body, and veins carry oxygen-poor blood back from the body to the heart. 

How does blood circulate through each chamber of the heart? You might think it's complicated, but its pretty. simple: Blood enters the right atrium and passes through the right ventricle. The right ventricle pumps the blood to the lungs where it becomes oxygenated. The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium. From the left atrium blood flows into the left ventricle.

How does blood flow to and from the lungs? At the lungs, the blood picks up oxygen and drops off carbon dioxide. The blood then returns to the heart through the pulmonary veins.

How does blood flow to and from the tissues of the body? Blood leaving the heart through the arteries is full of oxygen. The arteries split into smaller and smaller tubes. These bring oxygen and other nutrients to the cells of the body's tissues and organs.

What is the significance of oxygen and carbon dioxide? Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.

The End!