Blood Vessels (AQA A-Level Biology): Flashcards
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Practise the cards
10 cards from this deck
Artery function
Artery function
Transport blood away from heart
Arteriole function
Arteriole function
Regulate blood flow from arteries to capillaries
Vein function
Vein function
Return blood from capillaries to heart
Capillary function
Capillary function
Exchange O2, CO2, glucose between blood & cells
Blood flow sequence
Blood flow sequence
Heart→Arteries→Arterioles→Capillaries→Veins→Heart
Why arteries have thick elastic layers
Why arteries have thick elastic layers
Maintain high BP via stretch & recoil
Why arteries lack valves
Why arteries lack valves
High pressure prevents backward flow
Why veins have valves
Why veins have valves
Prevent backward flow under low pressure
Why vein walls thin
Why vein walls thin
Low pressure, no rupture risk, allows compression
Why capillary walls thin
Why capillary walls thin
Short diffusion distance for rapid exchange