The Heart As A Pump

Question 1

What is cardiac output ?

Answer 1

The total volume of blood pumped by the heart in one minute

Question 2

What is the equation for cardiac output ?

Answer 2

Cardiac output (L/min) = Heart rate (beats/min) x Stroke volume (L/beat)

Question 3

What does myogenic heart mean ?

Answer 3

The heart has the ability to generate its own electrical impulses

Question 4

What is the P wave ?

Answer 4

Depolarisation of atria

Question 5

What is the QRS complex ?

Answer 5

Depolarisation of ventricles

Question 6

What is the T wave ?

Answer 6

Repolarisation of ventricles

Question 7

What is heart rate modified by ?

Answer 7

1. ANS- sympathetic increases HR, parasympathetic slows HR
2. Circulating hormones

Question 8

What is an syncitium ?

Answer 8

A single cell containing several nuclei. Eg. The heart

Question 9

Systole

Answer 9

Contraction

Question 10

Diastole

Answer 10

Relaxation

Question 11

What are the events of the cardiac cycle ?

Answer 11

1. Atrial systole
2. Ventricular systole
3. Ventricular ejection
4. Ventricular diastole
5. Passive ventricular refilling

Question 12

What is stroke volume modified by ?

Answer 12

1. Intrinsic control: degree of stretch of cardiac muscle
2. Extrinsic control: sympathetic stimulation