the blood vessels Flashcards
what is the direction of blood flow in artery?
carries blood away from heart to the body
what is the direction of blood flow in vein?
towards the heart
what is the direction of blood flow in capillary?
carries blood to the tissues or from artery to vein
what is the blood pressure in vein?
low
what is the blood pressure in capillary?
low
what is the blood pressure in artery?
high
where are valves present between those three blood vessels?
only vein, the valves are present
lumen diameter for vein?
large lumen
lumen diameter for artery?
small lumen
lumen diameter for capillary?
small lumen
wall thickness for capillary?
very thin, one cell thick
wall thickness for artery?
thick
wall thickness for vein?
thin
why arteries have thick walls with muscle and fibres?
to withstand high pressure
function of muscles and elastic fibres in arteries?
allow the artery to expand and recoil with each surge of blood
arteries carries what type of blood?
carries oxygenated blood to the rest of body
veins carries what type of blood?
carries deoxygenated blood from the body back to the heart
why the walls of veins are made thin?
because blood is moving at a low pressure
why valves are present in veins?
to prevent backflow and to ensure blood flows in one direction only
why there is few muscles and elastic fibres in veins?
because blood does not surge through veins
why walls of capillaries are 1 cell thick?
walls are one cell thick, providing a thin, permeable surface for diffusion
