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Topic 6 > Control Of Heart Rate > Flashcards

Control Of Heart Rate Flashcards

1
Q

Cardiac muscle is ….

A

Myogenic

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2
Q

What does myogenic mean

A

Contracts on its own but rate of contraction controlled by wave of electrical activity

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3
Q

SAN sinoatrial node

A

Right atrium
Peacemaker - set peace of heart beat

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4
Q

AVN atrioventricular nose

A

Located border of right and left ventricle within atria

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5
Q

Bundle of his

A

Runs through septum

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6
Q

Purkyne fibres

A

Walls of ventricles

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7
Q

Control of heart rate

A
  1. SAN releases wave of depolarisation across atria causing to contract
  2. AVN realse another wav depolarisation - non conductive layer of tissue between Arita and ventricle prevents wave from reaching ventricles
  3. Bundle of his conducts wave of depolarisation down septum
  4. Apex then walls of ventricles contract - short delay AVN transmission second wave
  5. Allows tike for atria to pump blood into ventricles - repolarises cardiac muscle relax
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Topic 6 (4 decks)

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