Heart Conduction System

Question 1

What are the two main nodes? And where are they?

Answer 1

Sinoatrial Node - wall of right atrium
Atrioventricular node - interatrial septum

Question 2

What are the different vessels of the heart conduction system?

Answer 2

The Nodes
AV bundle
Left & Right Bundle Branches
Purkinje Fibres

Question 3

What is (re)polarisation?

Answer 3

The muscle fibers returning to their resting state (relaxing)

Question 4

What is depolarization?

Answer 4

Electrical activity within cardiac cells forcing them to contract

Question 5

What are the stages of an electrocardiagram?

Answer 5

P Wave (Atrial depolarization)
Pause (atrioventricular valves close)
QRS Wave (ventricular depolarization occurs simultaneously to atrial repolarization)
Pause (semilunar valves close)
T wave (ventricular repolarization occurs)

Question 6

Where does neural control of the heart come from?
Where is it delivered?

Answer 6

Cardiovascular centre (medullar oblongata)
Nervous system (sympathetic and parasympathetic)