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Physiology > Lecture 8 - Heart Rhythmicity/Normal ECG > Flashcards

Lecture 8 - Heart Rhythmicity/Normal ECG Flashcards

1
Q

How long is the delay from SA node signal to ventricular contraction?

A

0.16 seconds

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2
Q

Resting membrane potential of an SA node fiber?

A

-55 to -60 mV (threshold = -40 mV)

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3
Q

Parasympathetic innervation of the heart?

A

Vagus nerve

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4
Q

Vagus nerve neurotransmitter?

A

Acetylcholine (decreases heart rate)

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5
Q

Sympathetic innervation neurotransmitter?

A

norepinephrine (increases heart rate)

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Physiology (8 decks)

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