heart rate lab

korotkfoff sounds

result from turbulent and laminar flow

korotkoff sounds when reading BP

result from turbulent flow of blood through a semi-compressed vessel

when do you hear noise when measuring BP

turbulent flow and systolic BP

when do you hear silence when measuring BP

laminar flow, squeexing artery, and diastolic BP

pulse pressure formula

Systolic pressure — diastolic pressure

Mean arterial pressure formula 1

Diastolic pressure + Pulse pressure/3

why is mean arterial pressure not simply the average of systolic and diastolic pressures?

The heart spends more time in diastole at rest then systole

Mean arterial pressure formula 2

CO x TPR

if a blood vessel dilates, will the resistance increase or decrease

decrease

Where are the baroreceptors that change MAP located?

carotid sinus and aortic arch

what kind of change is sensed by baroreceptors?

pressure changes

pathway of baroreceptors

arch of aorta or carotid sinus—>cardiovasular control center in medulla—>autonomic NS—>either parasympathetic or sympathetic

how is blood redistributed when you go from supine to standing

blood rushed to feet, DBP increases, heart rate increases

What impact does redistribution of blood from supine to standing have on venous return?

Decreases, because less blood is being sent to the heart, so less is pumped out

how does the sympathetic NS affect heart rate, SV, CO, TPR, and BP

increases it

how does the parasympathetic NS affect heart rate, SV, CO, TPR, and BP

decreases it

When an increase in BP is detected by baroreceptors, what happens to the frequency of APs?

they increase as the arterial walls stretch

When a decrease in BP is detected by baroreceptors, what happens to the frequency of APs?

they decrease as the stretch on arterial walls lessen

what would an increase in venous return do to SV, CO, and BP?

it would increase them

what would a decrease in venous return do to SV, CO, and BP?

it would decrease them