Studied by 2 people
How is the shape of a red blood cell is related to its function
It is biconcave shape for increased surface area
flexible to can flow through easily
no nucleus to carry more oxygen
Explain why red blood cells cannot be stored in pure water
swell up and burst
lower water conc. inside than surroundings
water would diffuse inside and burst
Artery
Transports blood away from heart
withstand high pressure
carry oxygenated blood
elastic fibres to help it stretch and recoil with each surge of blood
endothelium layer reduces friction
collagen - protection
Vein
Transports blood to the heart
Carry deoxygenated Blood
have valves
thin walls
Cardiac output
Volume of blood by heart into system in one minute
Stroke volume
Volume of blood pumped each time left ventricle beats
Leukocytes
digests and destroys pathogens also produce antibodies
Erthocytes
Transports oxygen, removes carbon dioxide takes it to lungs to exhale
Role of haemoglobin
bind to oxygen
why can red blood cells not be stored in pure water
swell up and burst (lysis)
lower concentration of water molecules inside than outside it surroundings
water molecules differ inside
Give one reason why the wall of the left ventricle is thicker than the right.
Need to pump blood throughout the whole body .
right only need to pump to lungs so shorter distance
Note 
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