the anatomy of the vessels Flashcards
what are there 3 main layers that both arteries and veins have
- adventitia
- media
- intima
what is the internal elastic lamina like in veins
the internal elastic lamian is extremely thin in veins and is not easily visualised
what are all blood vessels lined with
- lined with an endothelium
- not lined with a basement membrane
what is the tunica media thicker in the artery or the vein
artery
what is the tunica media primary made of
smooth muscle
what blood vessel contains valves
veins
what do arteries and veins do
arteries carry blood away from the heart
veins carry blood towards the heart
do arteries always carry oxygenated blood
no
what innervates the smooth muscle of arteries and arterioles
sympathetic nervous system not the parasympathetic onerous system
what does sympathetic innervation of most blood vessels cause
vasoconstriction
which vessels constrict with sympathetic innervation and why
small arterioles and arteries constrict the most to control the distribution of blood
describe the pathway of blood through the vascular system
- conducting artery
- muscular artery
- arteriole
- capillaries
- venues
- veins
where are precapillary sphincters located
they are located at the end of the capillary bed
what do precapillary sphincters do
they control blood flow through the capillary bed or through the shunt
through where (capillary bed or shunt would must blood be flowing if you were a, lying in bed b, in a gym doing squats
A= shunt
B - capillary bed
