Mammalian Heart Function Overview Flashcards

Module 3 (3.2.3)

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1
Q

Myogenic

A

Heart’s ability to self-contract

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2
Q

Sinoatrial Node (SAN)

A

Specialized fibers in the right atrium, heart’s pacemaker

tissue is responsible for initiating the heartbeat

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3
Q

Atrioventricular Node (AVN)

A

Located between atria, passes electrical signals from the atria to the ventricles, resulting in ventricular systole

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4
Q

Bundle of His

A

Conducts excitation from atrioventricular node to apex

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5
Q

Purkyne Fibres

A

Branches of bundle of His, carry excitation upwards

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6
Q

Atrial Systole

A

Left and right atria contract together; blood is squeezed from the atria through the atrioventricular valves into the ventricles, down a pressure gradient.

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7
Q

Ventricular Systole

A

Ventricular blood pressure rises very quickly to a level above the arteries; semilunar valves open and blood rushes out of ventricles into the arteries

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8
Q

Cardiac Diastole

A

Once ventricular contraction is complete, heart muscle starts to relax, heart starts to fill with blood again and semilunar valves close

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9
Q

Semilunar Valves

A

Close in aorta and pulmonary arteries to prevent backflow

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10
Q

Why is the left ventricular wall so much thicker than the right ventricular walls?

A

Blood is pumped through the aorta and needs sufficient pressure to overcome the resistance of the systemic circulation

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11
Q

Why are there so many mitochondria in cardiac muscle?

A

Supply energy for contraction

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12
Q

Why is there a delay before the AVN depolarises the ventricular walls?

A

To allow the atria to finish contracting

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