intro to cardiovascular system Flashcards
composition of the cardiovascular system
blood heart arteries/veins capillaries lymphatics
pressures of the syetem
pulmonary - low
systemic - high
allows more time for diffusion of O2 in pulmonary
pulse pressure
difference between diastolic and systolic pressure
represents the force each time the heart contracts
layers of blood vessels
tunica intima - endothelial cells, non adherent surface
media - smooth/elastic muscle tissue
adventitia - fiberous loose connective tissue
what do vessels differ in
diameter
wall thickness
constituents
arteries
thick muscular wall
large diameter
arterioles
smaller diameter of lumen
less thick wall
smooth muscle to control diameter (control of BP)
capillaries
single tube endothelial
small lumen
leaky or tight walls depending on location
venules
under low pressure
some smooth muslces
veins
valves
thick tunica adventitia
lymphatic system
vessels and nodes
returns interstitial tissue fluid to circulation
subclavian vein links cardi and lymph system
homeostasis in CV system
baro and chemoreceptors
medulla
effectors - HR SV VT
heart reflexes
intrinsic - frank starling responce
heart pumps harder if more blood enters
extrinsic - e.g. hormones or ion conc
control of blood vessesl
vasoconstriction/dilation
determines BP
sympathetic fibres innervate smooth muscle
baroreceptor location
carotid sinus
aortic arch wall
