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Cardiac Muscle Function

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Questions and Answers

What is the effect of parasympathetic stimulation on AV conduction velocity?

Decrease in conduction velocity (correct)

Complete block of conduction

Increase in conduction velocity

No effect on conduction velocity

What is the effect of parasympathetic stimulation on heart rate?

Increase in heart rate

Initial increase followed by decrease in heart rate

No effect on heart rate

Decrease in heart rate (correct)

What is the effect of parasympathetic stimulation on atrial contractility?

Increase in atrial contractility

Initial increase followed by decrease in atrial contractility

No effect on atrial contractility

Decrease in atrial contractility (correct)

What is the effect of parasympathetic stimulation on cardiac excitability?

Decrease in cardiac excitability Signup and view all the answers

What is the effect of parasympathetic stimulation on ventricular contraction and relaxation?

No effect on ventricular contraction and relaxation Signup and view all the answers

What is the negative dromotropic effect of parasympathetic stimulation?

Decrease in AV conduction velocity Signup and view all the answers

What is the effect of muscarinic cholinergic receptor stimulation on K+ channels?

Opening of K+ channels Signup and view all the answers

What is the effect of K+ channel opening on the SA node cell?

Decrease in spontaneous diastolic depolarization Signup and view all the answers

What is the normal range of AV conduction time?

0.12-0.20 s Signup and view all the answers

What is the effect of parasympathetic stimulation on the funny current and T-type Ca2+ channels?

No effect on funny current and T-type Ca2+ channels Signup and view all the answers