Hammond Biology-Circulatory System


The heart and blood vessels carry out a transport function. They carry food molecules, water and oxygen to cells and remove waste products such as carbon dioxide. They form the circulatory system.

A double circulation

Instead of just being a single loop the circulation has two interconnected loops, in a sort of figure of eight.

circulatory system

Blood returns from the body to the right atrium. The blood has lost most of the oxygen it carries and is now deoxygenated.

The right ventricle pumps the blood along the pulmonary artery to the lungs where it picks up fresh oxygen. It is now oxygenated.

The oxygenated blood enters the left side of the heart and is pumped out through the aortato the body.

Once it reaches the capillaries around the…


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