Control of cardiac function

Question 1

Control of cardiac function

Cardiac output is?

Answer 1

The volume of blood pumped by the heart each minute

Question 2

Control of cardiac function

Cardiac output =

Answer 2

Heart rate X stroke volume

Question 3

Control of cardiac function

Atrial blood pressure =

Answer 3

Cardiac output X total peripheral resistance

Question 4

Control of cardiac function

Blood pressure refers to…

Answer 4

Atrial blood pressure

Question 5

Control of cardiac function

Preload

Answer 5

Venus return

Blood returning to the heart

Question 6

Control of cardiac function

Afterload

Answer 6

Pressure that opposes blood flowing from the aorta

Question 7

Control of cardiac function

What nerve is responsible for slowing down the heart

Answer 7

Vegal nerve

Question 8

Control of cardiac function

Increased heart rate

Answer 8

Tachycardia

Question 9

Control of cardiac function

Decreased heart rate

Answer 9

Brachycardia

Question 10

Control of cardiac function

Effect of vegal nerve on heart rate

Answer 10

Opens hyperpolarising K⁺ channels

Slows the rise of the pacemaker potential

Decreases heart rate

Question 11

Control of cardiac function

What nerve is responsible for increased heart rate?

Answer 11

Sympathetic nerve

Question 12

Control of cardiac function

Effect of sympathetic nerve on heart rate

Answer 12

Opens depolarising Ca²⁺ channels

Increases the rise of the pacemaker potential

Question 13

Control of cardiac function

What does the vegal nerve target to control heart rate?

Answer 13

SA node

AV node

Question 14

Control of cardiac function

Starling’s law of the heart

Answer 14

The force of contraction is a function of the length of the muscle fibre