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8380843
blood vessels
Descrição
AS level Biology Mapa Mental sobre blood vessels, criado por Dana Davies em 01-04-2017.
Sem etiquetas
blood
blood vessels
vein
capillary
artery
mass flow
mass transport
biology
as level
Mapa Mental por
Dana Davies
, atualizado more than 1 year ago
Mais
Menos
Criado por
Dana Davies
mais de 7 anos atrás
14
0
0
Resumo de Recurso
blood vessels
artery
elastic layer
thick
keeps blood pressure high
stretch and recoil prevents surges in pressure
overall to resist bursting under pressure
muscle layer
thick
smaller arterioles can be constricted + dilated
control volume of blood passing through
most pressure is absorbed by artery walls so less elastic fibres
valves/lumen
no valves as blood never flows backward bc of high pressure
vein
muscle layer
thin
carry blood from tissues, cant control it and slower
elastic layer
thin
blood pressure is low, no recoil action
valves/lumen
semi-lunar valves throughout
pressure is low so prevents backflow
capillary
numerous and highly branched + high SA
penetrate all organs and tissues
exchange between blood and cells
collects in venues then returned to veins
from arteries then arterioles
one cell thick endothelium = short DD + rapid diffusion
allows metabolic exhange
between blood and tissue fluid
flow of blood is much slower
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