Basics Flashcards
1
Q
Describe the sequence of contraction of the heart?
A
- Atria - atrial systole.
- Ventricle - ventricular systole.
2
Q
What happens to the chambers during diastole?
A
All four chambers are relaxed.
3
Q
What are the structures that make up the conduction system?
A
- SA node.
- Internodal atrial pathways.
- AV node.
- Bundle of His and its branches.
- Purkinje system.
4
Q
What is the cardiac pacemaker of the heart?
A
SA node.
5
Q
How is the SA node the cardiac pacemaker?
A
Its rate of discharge determines the rate at which the heart beats.
6
Q
What is the basic pathway of conduction in the heart?
A
- SA node generates impulse.
- Impulse goes to AV node via atrial pathways.
- Goes down the bundle of His in the inter-ventricular septum.
- Via the branches of bundle of His goes via the purkinje fibres to the ventricular muscles.