Cardiac Conduction Worksheet Flashcards

1
Q

What is the function of the conduction system?

A

initiate and transmit the electrical impulses responsible for the coordinated contractions of each cardiac cycle.

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2
Q

What does it mean for a cardiac cell to be connective?

A

can propagate from one cell to another via gap junctions.

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3
Q

What does it mean for a cardiac cell to be autorhythmic?

A

can excite themselves spontaneously without simulation of the nervous system and contract at a regular rhythm.

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4
Q

Sinoatrial Node’s average beats per minute

A

100 beats/min

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5
Q

Atrioventricular node’s average beats per minute

A

40-50 beats/min

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6
Q

Ventricles average beats per minute

A

20-40 beats/min

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7
Q

What is the function of the SA node?

A

Sets the rate of contraction for the heart. Spontaneously contracts and generates nerve impulses that travel throughout the heart wall causing both atria to contract.

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8
Q

Contrast a healthy heart ECG with an abnormal one in which ventricular excitation is independent of atrial excitation

A

entricular excitation is independent of atrial excitation the pace of ventricular excitation is being sent by the ventricles slower natural rhythm not by stipulation from the SA node atria

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9
Q

Contrast the resting potential of typical myocardial cells with that of SA node cells

A

Typical contractile cells in the myocardium has a resting membrane potential

Cells of the SA node is not fixed and is known as the pacemaker potential

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10
Q

What two factors combine to determine heart rate?

A

Extrinsic and Intrinsic controls

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11
Q

Contrast the effects of acetylcholine and norepinephrine on heart rate

A

Acetylcholine- lowers heart rate

Norepinephrine- increases heart rate

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12
Q

What do parasympathetic neurons secrete?

A

Acetylcholine

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13
Q

What do sympathetic neurons secrete?

A

Norepinephrine

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