Cardiovascular System

Question 1

Define cardiac output (CO).

Answer 1

Volume of blood ejected from left ventricle into aorta per min

Question 2

Define stroke volume.

Answer 2

Volume of blood ejected left ventricle per beat

Question 3

What 3 factors regulate SV?

Answer 3

Degree of stretch in heart before it contracts (Frank-Starling law), forcefulness of contraction of individual ventricular muscle fibres, pressure required to eject blood from ventricles

Question 4

What happens when body temp. increases?

Answer 4

HR increases -> SA node discharges more rapidly

Question 5

What 3 sensory receptors does the CV centre receive input from?

Answer 5

Proprioceptors, baroreceptors, chemoreceptors

Question 6

What do proprioceptors do?

Answer 6

Detect movements in joints + muscles

Question 7

What do baroreceptors do + where are they located?

Answer 7

Send impulses to CV centre to regulate BP - aorta, internal carotid arteries, other large parties in neck + chest

Question 8

What do chemoreceptors do + where are they located?

Answer 8

Monitor blood levels of o2/co2/H+ + CV centre responds by increasing sympathetic stimulation of arteries + veins -> vasoconstriction + increase BP - 2 carotid bodies in common carotid arteries + in aortic body in aorta arch