L42 - Cardiac output 2 - mechanical events and stroke volume

Question 1

What can the cardiac cycle be divided into?

Answer 1

• systole - ventricular contraction, blood ejection
• diastole - ventricular relaxation, blood filling

Question 2

What is the cardiac cycle driven by?

Answer 2

changes in pressure within ventricles

Question 3

What are the valves like during ventricular contraction?

Answer 3

• AV valve - closed, P ventricles > atria
• aortic, pulmonary valves - closed, P ventricles < arteries

Question 4

What are the valves like during ventricular ejection?

Answer 4

• AV valve - closed, P ventricles > atria
• aortic, pulmonary valves - open, P ventricles > arteries

Question 5

What are the valves like during ventricular relaxation?

Answer 5

• AV valve - closed, P ventricles > atria
• aortic, pulmonary valves - closed, P ventricles < arteries

Question 6

What are the valves like during ventricular filling, -ve P in ventricles

Answer 6

• AV valve - open, P ventricles < atria
• aortic, pulmonary valves - closed, P ventricles < arteries

Question 7

What are the valves like during ventricular filling, atrial contraction?

Answer 7

• AV valve - OPEN
• aortic, pulmonary valves - CLOSED