Coordination Of Heart Action Flashcards

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1
Q

What is the sinoatrial node

A

Located in the wall of the right atrium

it acts as the hearts pacemaker buy transmitting waves of electrical activity along the atria walls ate regular intervals

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2
Q

How do the electrical waves affect atria contraction

A

The electrical waves induce simultaneous contraction of both atria forcing blood into the ventricles

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3
Q

Why is there a delay in in electrical activity of atria

A

Electrical activity cant pass from atria to ventricles due to non conducting tissue

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4
Q

Why is the delay in electrical activity important

A

It ensures the atria is empty before the ventricles contract

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5
Q

What is the function of the atrioventricular node

A

Carries electrical impulses to the ventricles after the delay to ensure the ventricles are full with blood

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6
Q

What happens after the electrical impulse passes through the AVN node

A

It goes to the bundle of his which is a group of conducting tissue that transmits the electrical impulses to the hearts apex and then around the ventricles walls along the purkyn fibres

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7
Q

What happens after the electrical impulse pass along the purkyne fibres

A

The ventricles contract simultaneously forcing blood out of the aorta and pulmonary artery

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