Basics Flashcards

1
Q

Describe the sequence of contraction of the heart?

A
  1. Atria - atrial systole.
  2. Ventricle - ventricular systole.
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2
Q

What happens to the chambers during diastole?

A

All four chambers are relaxed.

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3
Q

What are the structures that make up the conduction system?

A
  1. SA node.
  2. Internodal atrial pathways.
  3. AV node.
  4. Bundle of His and its branches.
  5. Purkinje system.
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4
Q

What is the cardiac pacemaker of the heart?

A

SA node.

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5
Q

How is the SA node the cardiac pacemaker?

A

Its rate of discharge determines the rate at which the heart beats.

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6
Q

What is the basic pathway of conduction in the heart?

A
  1. SA node generates impulse.
  2. Impulse goes to AV node via atrial pathways.
  3. Goes down the bundle of His in the inter-ventricular septum.
  4. Via the branches of bundle of His goes via the purkinje fibres to the ventricular muscles.
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