Blood and the circulatory system
- Created by: revising
- Created on: 26-03-13 12:01
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- Blood and the circulatory system
- Red blood cells
- Transport blood from lungs to rest of body.
- No nucleus so can be packed with haemoglobin- a substance that binds with oxygen.
- Have a biconcave shape to give them a large surface area for exchanging oxygen.
- White blood cells
- Help fight infection by protecting body against attack from microorganisms.
- Plasma
- This is the liquid that carries nutrients (e.g. glucose and amino acids), antibodies, hormones and waste (e.g. carbon dioxide and urea.)
- Platelets
- Small fragments of cells that help blood to clot at the site of a wound.
- Double circulatory system
- Two circuits joined together.
- The first pumps deoxygenated blood to the lungs to take in oxygen. The blood returns to the heart.
- The second pumps oxygenated blood around the body. Blood gives up oxygen at body cells and th deoxygenated blood returns to heart to be pumped out to lungs again.
- The first pumps deoxygenated blood to the lungs to take in oxygen. The blood returns to the heart.
- Two circuits joined together.
- Red blood cells
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