Physiology: cardiac cycle

Question 1

what are the different stages of the cardiac cycle, in order (5)

Answer 1

passive filling
atrial contraction
isovolumetric ventricular contraction
ventricular ejection
isovolumetric ventricular relaxation

Question 2

what valves are open/closed during passive filling

Answer 2

AV valves open

SL valves closed

Question 3

what causes the AV valves to open

Answer 3

when atrial pressure > vetricular pressure

Question 4

what valves are open/closed during atrial contraction

Answer 4

AV valves open

SL valves closed

Question 5

what valves are open/closed during isovolumetric ventricular contraction

Answer 5

AV valves closed

SL valves closed

Question 6

in isovolumteric ventricular contraction what causes AV valves to shut

Answer 6

ventricular pressure > atrial pressure

Question 7

what is heard during isovolumetric ventricular contraction

Answer 7

S1 - first heart sound

“lub”

Question 8

what valves are open/closed in ventricular ejection

Answer 8

AV valves closed

SL valves open

Question 9

what causes the SL valves to open in ventricular ejection

Answer 9

ventricular pressure > aortic pressure

Question 10

what valves are open/closed in isovolmetric ventricular relaxation

Answer 10

AV valves closed

SL valves closed

Question 11

what is heard during isovolumetric ventricular relaxation

Answer 11

S2 - second heart sound

“dub”

Question 12

what causes SL valves to close in isovolumetric ventricular relaxation

Answer 12

aortic pressure > ventricular pressure