The Heart

Question 1

Cardiac output equaiton

Answer 1

cardiac output (L/min) = heart rate (bpm) x stroke volume (L/beat)

Question 2

What modifies the heart rate

Answer 2

Autonomic nervous system (sympathetic and parasympathetic)

Question 3

What modifies the stroke volume

Answer 3

Intrinsic control: degree of stretch of cardiac muscle

Extrinsic control: sympathetic stimulation

Question 4

P wave of ECG

Answer 4

Depolarisation of atria

Question 5

QRS complex on ECG

Answer 5

Depolarisation of ventricles

Question 6

T wave on ECG

Answer 6

Repolarisation of ventricles

Question 7

PR interval on ECG

Answer 7

Conduction through AV node

Question 8

QT duration on ECG

Answer 8

Ventricular depolarisation and repolarisation

Question 9

Affect of parasympathetic stimulation on heart rate

Answer 9

Slows it down

Question 10

Affect of sympathetic/adrenergic stimulation on heart rate

Answer 10

Accelerates heart rate

Question 11

Systole

Answer 11

Contraction of chamber and ejection of blood

Question 12

Diastole

Answer 12

Relaxation and filling