the circulatory system
- Created by: Sc1602
- Created on: 22-03-18 18:43
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- circulatory system
- blood
- red blood cells
- carry oxygen
- bi-concave disc for LSA
- no nucleus for more space
- haemoglo-bin (red pigment) binds to oxygen
- forms oxyhaemo--globin which is broken down in body cells to obtain oxygen
- carry oxygen
- white blood cells
- defend against pathogens
- engulf
- antibodies
- antitoxins
- defend against pathogens
- platelets
- help blood clot at wounds
- cell fragments
- plasma
- carries: urea, blood cells, hormones, CO2, amino acids, glucose
- red blood cells
- the heart and lungs
- upper-atriums
- lower- ventricles
- coronary arteries deliver oxygenate--d blood
- blood vessels
- arteries
- narrow lumen
- keep blood at high pressure
- thick muscle and elastic fibres
- withstand high pressures
- narrow lumen
- veins
- low pressure
- thin muscle and elastic fibres
- wide lumen
- valves
- keep blood flowing in right direction
- low pressure
- capillaries
- no elastic fibres or smooth muscle
- one cell thick
- gas exchange
- short diffusion distances
- deliver maxiumum oxygen and glucose to cells
- gas exchange
- arteries
- blood
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