Cardiac physiology Q6

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Questions and Answers

whats the function of elasticity in blood vessels wall?

absorbs the pressure as blood flow into the vessels which prevent a sharp rise in pressure in the vessel.

whats the function of elastic tissue (recoil) in the vessels?

its important between heart beats, to allow blood to continue to flow as it puts pressure inside the vessels.

when do arteries expand and when do they recoil?

-they do expand during ventricular contraction as blood is being ejected into arteries (semi-lunar valve open)>aorta and arteries expand and store pressure in elastic walls.

they do recoil during isovolumic ventricular relaxation as semi-lunar valve shut to prevent backflow of blood into ventricles> elastic (recoil) of arteries send blood forward into the circulatory system.

which 2 mechanisms regulate BP?

autonomic mechanism hormonal mechanism Signup and view all the answers

the primary mechanism for blood pressure in an acute setting?

a baroreceptor (sensitive sensory nerve root endings) located in the carotid sinus and aortic arch)> decrease heart rate and arterial pressure. Signup and view all the answers

how long term BP is maintained?

renin-angiotensin-aldosterone mechanism. Signup and view all the answers

whats vasoconstriction?

contraction of smooth muscle in the vessel walls> narrowing of the lumen> increase the resistance of blood vessels to blood flow. Signup and view all the answers

what causes vasoconstriction?

the sympathetic nerve activity and the hormone angiotensin II. Signup and view all the answers

whats vasodilation?

relaxation of smooth muscles and the vessel walls>widen the lumen of vessels>decrease the resistance of blood vessels to blood flow. Signup and view all the answers

what causes vasodilation?

caused by withdrawal of sympathetic nerve activity and locally released chemicals eg lactic acid. Signup and view all the answers

Flashcards

Elasticity in blood vessel walls

Absorbs pressure as blood flows in, preventing a sharp rise in vessel pressure.

Elastic recoil in vessels

Keeps blood flowing between heartbeats by maintaining pressure in vessels.

Artery expansion/recoil

Arteries expand during heartbeats to store pressure, recoiling during relaxation to send blood forward.