Human Body - The Heart and Lungs

The Respiratory System

Air enters the body through your mouth or nose. It then travels down your trachea (windpipe) which divides into two tubes called bronchi. These tubes carry air into each lung. The diaphragm is a muscle that controls breathing. This muscle becomes flat to let air into the lungs, and relaxes to push air out of the lungs.

The Circulatory System

Blood carries things like oxygen and nutrients to each cell in the body. The heart pumps blood through the body through a system of tubes called blood vessels.

The Circulatory System

Arteries are a type of blood vessel that carries oxygen-rich blood away from the heart. Veins are another type of blood vessel which carries oxygen-poor blood back to the heart.

The Chambers

Right and left atrium

Right and left ventricles

​The heart and lungs

​The circulation system links the heart lungs and all the tissues that need blood.​

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​The heart is a double pump, the heart pumps blood to the lungs and body. At the lungs oxygen passes into the blood and carbon dioxide passes out of the blood

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