KA 5: The Structure and Function of the Heart

Question 1

Cardiac output

Answer 1

The volume of blood pumped through each ventricle per minute

Question 2

How do you calculate cardiac output?

Answer 2

Stroke volume x heart rate

Question 3

Heart rate

Answer 3

Number of contractions of the heart per minute

Question 4

Stroke volume

Answer 4

The volume of blood ejected from the heart in one contraction

Question 5

Diastole

Answer 5

Relaxation of the heart

Question 6

Systole

Answer 6

Contraction of the heart

Question 7

What happens during diastole?

Answer 7

Blood returning to the atria flows into the ventricles

Question 8

What happens during atrial systole?

Answer 8

Atrial systole transfers the remainder of the blood through the AV valves to the ventricles

Question 9

What happens during ventricular systole?

Answer 9

Closed the AV valves and pumps the blood through the semi - lunar valves to the aorta and pulmonary artery.

Question 10

What causes the heart sounds heard with a stethoscope?

Answer 10

The opening and closing of the AV and SL valves

Question 11

What position are the valves during diastole?

Answer 11

AV valves are open; SL valves are closed

Question 12

What position are the valves during atrial systole?

Answer 12

AV valves are open; SL valves are closed

Question 13

What position are the valves during ventricular systole?

Answer 13

AV valves are closed; SL valves are open

Question 14

Where does the heartbeat originate?

Answer 14

In the heart

Question 15

What sets the rate at which the heart contracts?

Answer 15

The auto-rhythmic cells of the sino-atrial node (SAN) or pacemaker, located in the wall of the right atrium.

Question 16

What controls the timing of cardiac muscle cell contraction?

Answer 16

impulses from the SAN spreading through the atria causing atrial systole