The Cardiac Cycle and Heart Sounds

Question 1

What is late diastole (stage 1)?

Answer 1

Both atria and ventricles relaxed

Question 2

What is atrial systole (2)?

Answer 2

Atrial contraction forces small amount of blood to ventricle.

Question 3

What is isovolumetric contraction?

Answer 3

Pushes av valves shut but doesn’t open semilunar valves.

Question 4

What’s ventricular ejection (4)?

Answer 4

Pressure rises and blood is ejected.

Question 5

What is isovolumetric ventricular relaxation (5)?

Answer 5

Ventricles relax

Question 6

What causes the S1 heart sound?

Answer 6

Mitral and tricuspid valves closing

Question 7

What causes the S2 heart sound?

Answer 7

Aortic and pulmonary valves closing.

Question 8

What could be the cause of a continuous murmur?

Answer 8

Patent ductus arteriosus

Question 9

What can cause systolic murmurs?

Answer 9

Aortic/pulmonary stenosis
Mitral/tricuspid regurgitation

Question 10

What can cause diastolic murmurs?

Answer 10

Mitral/tricuspid stenosis
Aortic/pulmonary regurgitation

Question 11

What causes the S3 heart sound?

Answer 11

Rapid ventricular filling

Chordae tendineae twang

Question 12

What causes the S4 heart sound?

Answer 12

Stiff/hypertrophic ventricle