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A&P > Heart Conduction > Flashcards

Heart Conduction Flashcards

1
Q

What area of the heart’s electrical conduction is known as the “pacemaker” of the heart?

A

SA node

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2
Q

What area of the heart is responsible for the delay of conduction between the artrium and ventricles?

A

AV node

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3
Q

True or False: Bachmann’s bundle is located in the left artrium.

A

True

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4
Q

True or False: Depolarization of the heart muscle is when the muscle contracts and repolarization is when the heart muscle rests.

A

True

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5
Q

The SA node fires at a rate of?

A

60-100bpm

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6
Q

On an EKG the P-wave represents what area of the heart?

A

SA node

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7
Q

What part of the heart’s electrical system is known as the “gatekeeper”?

A

AV node

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8
Q

What area of the heart forms the PR segment on the EKG?

A

AV node and Right and Left Bundles

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9
Q

What area of the heart forms the QRS part on an EKG?

A

Purkinje fibers

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10
Q

True or False: The SA node is located in the Left atrium

A

False: It is located in the right atrium

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11
Q

What is the correct sequence of electrical conduction of the heart?

A

SA node, internodal pathways, AV node, Bundle of His, Right and Left Bundle Branch, Purkinje fibers

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12
Q

When the SA node initiates an impulse, it sends a wave of excitation through?

A

The Atria

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13
Q

The Bundle of His transmits electrical signals through the..

A

Septum

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14
Q

In which phase of cardiac conduction do calcium channels close?

A

Rapid repolarization

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15
Q

In cardiac conduction, the resting potential is maintained by:

A

Leaky potassium channels

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16
Q

An influx of which of the following ions promotes depolarization during cardiac conduction?

A

Sodium

17
Q

Which phase of cardiac conduction distinguishes cardiac muscle cells from skeletal muscle cells?

A

Prolonged depolarization

18
Q

What physiological event occurs in Phase 1, the peak of a cardiac action potential?

A

Sodium channels close

19
Q

Which of the following statements describes an absolutely refractory period in cardiac conduction?

A

A second action potential cannot be initiated

A&P (8 decks)

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