Cardiac Conduction and ECG.

Question 1

What is the Sinoatrial node?

Answer 1

Initiating region for electrical impulse.

Question 2

What is the atrioventricular node?

Answer 2

Delay node to enable ventricular filling.

Question 3

What are the bundle branches?

Answer 3

Electrical conductance pathways through left and right myocardium, include bundle of His.

Question 4

What are the purkinje fibres?

Answer 4

Specialised cardiac myocyte cells which are responsible for translating electrical impulse into contractile force.

Question 5

How many times does the SA node fire in order to initiate a heartbeat?

Answer 5

Around 80 - 100 beats per minute.

Question 6

What is the purpose of prepulse potential?

Answer 6

Sets pace for firing of electrical activity in the heart.

Question 7

What is the steps for cell to cell communication?

Answer 7

Electrical Activity -> Action Potential Firing -> Depolarisation -> Contraction of Cardiomyocytes.

Question 8

What is the purpose of an ECG?

Answer 8

Measures the electrical activity in the heart.

Question 9

What does an ECG record?

Answer 9

Records atrial and ventricular depolarisation and repolarisations.

Question 10

What is the P wave?

Answer 10

Atrial Depolarisation

Question 11

What is the QRS complex?

Answer 11

Ventricular Depolarisation

Question 12

What is the T wave?

Answer 12

Ventricular Repolarisation