Cardiac Pacemaker Cells Membrane Potential Quiz

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What triggers the next impulse in rhythmically discharging cells?

IK bringing about repolarization

Prepotential or pacemaker potential (correct)

Activation of the 'h' channel

Membrane potential reaching a hyperpolarized level

What type of channels opens at the peak of each impulse to bring about repolarization?

'F' channel

H channels (correct)

T channels

L channels

What is another name for the channel activated following hyperpolarization due to its unusual activation?

'L' channel

'Ih' channel

'T' channel

'Funny' channel (correct)

What completes the prepotential in rhythmically discharging cells by producing the calcium current?

'T' channels Signup and view all the answers

Which part of the cell membrane begins to depolarize as Ih increases, forming the first part of the prepotential?

The membrane Signup and view all the answers

Which part of the heart's conduction system lacks a sharp, rapid depolarizing spike before the plateau in its action potentials?

SA and AV nodes Signup and view all the answers

What happens to the slope of prepotentials in nodal tissue when cholinergic vagal fibers are stimulated?

Decreases Signup and view all the answers

How does acetylcholine affect the membrane of nodal tissue?

Increases K+ conductance Signup and view all the answers

What is the mechanism through which M2 muscarinic receptors affect the nodal tissue?

Open a special set of K+ channels Signup and view all the answers

What effect does strong vagal stimulation have on the rate of spontaneous discharge?

May abolish it for some time Signup and view all the answers

How does norepinephrine, secreted by sympathetic endings, affect the L channels in nodal tissue?

Facilitates their opening Signup and view all the answers

What is the role of the sympathetic cardiac nerves in speeding up the rate of spontaneous discharge?

Speeds up the depolarizing effect of Ih Signup and view all the answers

Cardiac Pacemaker Cells Membrane Potential Quiz

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Questions and Answers

What triggers the next impulse in rhythmically discharging cells?

What type of channels opens at the peak of each impulse to bring about repolarization?

What is another name for the channel activated following hyperpolarization due to its unusual activation?

What completes the prepotential in rhythmically discharging cells by producing the calcium current?

Which part of the cell membrane begins to depolarize as Ih increases, forming the first part of the prepotential?

Which part of the heart's conduction system lacks a sharp, rapid depolarizing spike before the plateau in its action potentials?

What happens to the slope of prepotentials in nodal tissue when cholinergic vagal fibers are stimulated?

How does acetylcholine affect the membrane of nodal tissue?

What is the mechanism through which M2 muscarinic receptors affect the nodal tissue?

What effect does strong vagal stimulation have on the rate of spontaneous discharge?

How does norepinephrine, secreted by sympathetic endings, affect the L channels in nodal tissue?

What is the role of the sympathetic cardiac nerves in speeding up the rate of spontaneous discharge?

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