components of blood
- Created by: Lottie Hodson
- Created on: 24-04-13 00:17
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- COMPONENTS OF BLOOD
- RED BLOOD CELLS
- Transport oxygen
- Contain haemoglobin
- A pigment that combines with oxygen to for oxyhaemoglobin
- Bi-cocave shape to increase surface area
- Large surface area
- Oxygen is closer to the surface to diffuse
- Diameter is the same size as capillaries to increase PRESSURE
- WHITE BLOOD CELLS
- Help our immune system
- Able to squeeze through the walls of the blood vessels
- Phagocytes ingest invading micro-organisms and lytic enzymes digest them
- Rendering them harmless
- Lymphocytes produce specific antibodies
- PLATLETS
- The remains of dead cells
- No nucleus and don't behave like normal cells
- 1. Help to make tiny fibres that form a net
- 2. Red blood cells get trapped in the net
- 3. The clot dries, forming a scab which protects the cut whilst new skin grow
- 2. Red blood cells get trapped in the net
- PLASMA
- The blood fluid
- Mostly made of water
- Some substances can dissolve in it
- Carries the 3 other types of blood cells
- Both useful substances (digested food) and waste substances (CO and urea)
- Dissolve into plasma and are transported around the body
- 55% of blood
- RED BLOOD CELLS
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