Human Biology-Circulatory system
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Describe the structure and function of the heart.
The heart is the pump that pushes blood around the body. It is located between the two lungs in the mediastinum, behind and slightly to the left of the sternum. The heart is a conical shape approximately 12cm long, 9cm at its widest point and 6cm thick, making it about the size of an adult fist.
Describe the structure and function of the veins.
Veins carry blood towards the heart.
Describe the structure and function of the arteries.
Arteries are the blood vessels that carry blood away from the heart.
Describe the structure and function of the capillaries.
Capillaries are the link between arteries and veins.
Describe the main functions of blood.