Topic 3- the cardiac cycle

Question 1

What is the cardiac cycle?

Answer 1

series of events that take place in one heart beat, including muscle contraction and relaxation

Question 2

What is systole?

Answer 2

contraction of the heart

Question 3

What is diastole?

Answer 3

relaxation of the heart

Question 4

Is the cardiac cycle a continuous process?

Answer 4

Yes- the blood doesnt stop flowing at any point

Question 5

What happens to the volume of blood when the heart contracts?

Answer 5

Decreases

Question 6

What happens to the volume of blood when the heart relaxes?

Answer 6

Increases

Question 7

In terms of pressure, what happens when the volume decreases?

Answer 7

Increases

Question 8

In terms of pressure, what happens when the volume increases?

Answer 8

Decreases

Question 9

When valves open, what is the pressure?

Answer 9

The pressure behind them is greater than in front of them

Question 10

When valves close what is the pressure?

Answer 10

The pressure in front of them is greater than behind them

Question 11

Why are valves an important mechanism?

Answer 11

Prevent backflow