Ex 3: Cardiac cycle

Question 1

What is the cardiac cycle influenced by?

Answer 1

1. exercise
2. parasympathetic nerves
3. sympathetic nerves
   4.cardiac control center (medulla oblongata)
4. body temperature
   potassium ions
   calcium ions

Question 2

One heartbeat is what?

Answer 2

one cardiac cycle

Question 3

What happens in diastole?

Answer 3

blood flows into ventricles

Question 4

What happens in systole?

Answer 4

blood pressure builds before ventricle contracts, pushing blood out

Question 5

What are the four phases of Wigger’s diagram?

Answer 5

1. Ventricular filling
2. Isovolumic contraction
3. Ventricular ejection
4. Isovolumic relaxation

Question 6

What is Cardiac output?
A. amount of blood pumped per unit of time
B. stroke volume x heart rate
C. ml/beat X beats/min- ml/min
D. All of the above

Answer 6

D. all of the above

Question 7

What can affect stroke volume (and therefore cardiac output)

Answer 7

A. Preload
B. Afterload
C. Contractility
D. All of the above