The Blood
Teacher recommended
?- Created by: Jasmin
- Created on: 06-05-13 12:05
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- The Blood
- Red blood cells
- Pick up oxygen from the lungs. Carry oxygen to tissues and cells where it is needed
- Shape: biconcave discs
- Large SA to volume ratio - diffusion of oxygen can take place
- In lungs: haemoglobin + oxygen ---> (reversible reaction) oxyhaemoglobin
- Red pigment - haemoglobin - carry oxygen
- No nucleus - more space to pack in haemoglobin
- White blood cells
- Bigger than red and fewer of them
- Have a nucleus
- Part of bodys defence system - defend against disease
- Produce antibodies to fight microorganisms and antitoxins to neutralise any toxins produced by microrganisms
- Others digest invading bacteria/virus
- Platelets
- Small fragments of cells.no nucleus
- Help blood to clot
- Help produce a network of protein threads
- Threads capture lots of red blood cells and more platelets to form jelly - like clot
- Clot dries and hardens to form a scab
- Scab protects new skin as it grows and stops bacteria getting in your body
- Clot dries and hardens to form a scab
- Threads capture lots of red blood cells and more platelets to form jelly - like clot
- Lack of platelets cause excessive bleeding and bruising
- Plasma
- Carries everything in the blood
- Transport medium - yellow liquid
- Red, white blood cells, platelets, hormones, antibodies/antitoxins
- Nutrients like glucose, amino acids, CO2 from organs to lungs, Urea from liver and kidney
- Red blood cells
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