1.1 stroke volume,Heart Rate & Cardiac Output

Question 1

What is stroke volume

Answer 1

Vol of blood pumped out by the heart ventricles in each contraction

Question 2

What does stroke volume depend upon

Answer 2

Venous return
The elasticity of cardiac fibres
Contractility of cardiac tissue

Question 3

What is the venous return

Answer 3

Vol of blood returning to the heart via veins

Question 4

What is the elasticity of cardiac fibres

Answer 4

Concerned with the degree of stretch of cardiac tissue during diastole phase of the cardiac cycle

Question 5

What is starlings law

Answer 5

Increase venous return means greater diastolic filling of the heart thus makes the cardiac muscle stretch so more force of contraction means an increased ejection fraction

Question 6

What happens the greater the contractility of cardiac tissue

Answer 6

The greater is it the greater the force of contraction and results in a increase in stroke volume

Question 7

What is teh average heart rate

Answer 7

72 beats per minute

Question 8

What is cardiac output

Answer 8

The volume of blood pumped out by the heart ventricles per minute

Question 9

How do you work out cardiac output

Answer 9

Stroke volume x heart rate

Question 10

What is cardiac hypertrophy

Answer 10

When cardiac musclulat wall thickens so it becomes bigger and stronger from regular aerobic training

Question 11

What is Bradycardia

Answer 11

When cardiac hypertrophy occurs the ventricle can contract with more force and push out more blood
The heart doesn’t have to beat as often so resting heart rate will decrease