Circulation And Cardiac Output

Question 1

Cardiac output

Answer 1

Volume of blood pumped out of heart in one minute

Question 2

Cardiac output equation

Answer 2

Stroke volume X heart rate

Question 3

Factors affecting cardiac output

Answer 3

Weaker contraction strength
Lower blood volume

Question 4

Bradycardia

Answer 4

Slow heart rate (less than 60 bpm)

Question 5

Tachycardia

Answer 5

Rapid heart rate (more than 100 bpm)

Question 6

What causes Peripheral resistance

Answer 6

Arterioles can alter their diameter due to elastic tissue
Contraction of the smooth muscle cells will increase blood pressure

Question 7

Control of blood pressure

Answer 7

1) Baroreceptors detect increase/ fall in pressure due to stretch of arterioles
2) leads to decrease in nerve activity from receptors, sending a signal to cardiovascular control centre in brain
3) sympathetic or parasympathetic nervous system stimulated