9. Cardiac Cycle

Question 1

What is pulmonary arterial pressure?

Answer 1

25/10 mmHg

Question 2

What is systemic arterial pressure?

Answer 2

120/80 mmHg

Question 3

How do you calculate pulse pressure?

Answer 3

Systolic BP - Diastolic BP

Question 4

How do you calculate Mean Arterial Pressure?

Answer 4

Diastolic BP - (Pulse Pressure/3)

Question 5

What is cardiac output?

Answer 5

Volume of blood pumped per ventricle per minute

Question 6

Give details of the cardiac cycle

Answer 6

1. Action Potential in the SA node
2. Depolarisation through atria causes them to contract
3. Depolarisation spreads to the AV node
4. Delay, then ventricles contract

Question 7

What does the P-Wave show on an ECG?

Answer 7

Spread of depolarisation through the atria

Question 8

What does the QRS complex show on an ECG?

Answer 8

Depolarisation of ventricles

Question 9

What does the T-Wave show on an ECG?

Answer 9

Ventricular repolarisation

Question 10

What is the first sound on a phonocardiogram?

Answer 10

AV valve closes as ventricle contracts

Loudest sound

Question 11

What is the second sound on a phonocardiogram?

Answer 11

Aortic/pulmonary valves close

Rapid snap

Question 12

What is the third sound on a phonocardiogram?

Answer 12

Transition between rapid and slow filling of ventricle

Question 13

What is the fourth sound on a phonocardiogram?

Answer 13

Atria contract

Rush of blood into the ventricles