Cardiac Cycle

Question 1

At 75 bpm, how long are ventricular diastole and systole?

Answer 1

Diastole = 0.5 secs, systole = 0.3 secs

Question 2

In systole, where does the left ventricle pump blood?

Answer 2

Aorta

Question 3

In systole, where does the right ventricle pump blood?

Answer 3

Pulmonary artery

Question 4

What is the pressure in the atria and ventricles during passive filling?

Answer 4

Close to 0

Question 5

Describe what occurs in passive filling.

Answer 5

AV valves open, venous return flows into ventricles

Question 6

How full do ventricles become during passive filling?

Answer 6

80%

Question 7

In passive filling, are pressures higher on left or right side of the heart?

Answer 7

left

Question 8

Is the aortic valve opened or closed in passive filling?

Answer 8

Closed

Question 9

What in the ECG signals atrial depolarization?

Answer 9

P waves

Question 10

When in the ECG do atria contract?

Answer 10

Between p wave and QRS

Question 11

What is the end diastolic volume in normal adults?

Answer 11

130ml

Question 12

When does ventricular contraction start in an ECG?

Answer 12

After QRS

Question 13

When do AV valves shut and what does this produce?

Answer 13

When ventricular pressure exceeds atrial pressure, producing 1st heart sound

Question 14

What is isovolumetric contraction?

Answer 14

Tension rises around closed volume, and ventricular pressure rises

Question 15

In ventricular ejection, which valves open?

Answer 15

Aortic and pulmonary

Question 16

What is ejected by the ventricle to leave behind the end systolic volume?

Answer 16

Stroke volume

Question 17

After ventricular ejection, what happens to aortic pressure?

Answer 17

rises

Question 18

What do T-waves signal?

Answer 18

ventricular repolarization

Question 19

What happens to ventricular pressure after ventricular ejection?

Answer 19

falls

Question 20

When do Aortic and pulmonary valves shut?

Answer 20

After ventricular ejection, when ventricular pressure falls below aortic

Question 21

What produces the dicrotic notch in an aortic pressure curve?

Answer 21

valve vibrations

Question 22

When does isovolumetric ventricular relaxation start?

Answer 22

after closure of aortic and pulmonary valves

Question 23

What occurs in isovolumetric ventricular relaxation?

Answer 23

Tension falls around close volume

Question 24

When do AV valves open?

Answer 24

After isovolumetric ventricular relaxation