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Functions of Sympathetic Cardiac Nerves

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Questions and Answers

What is the main effect of sympathetic nerves on the cardiac muscle?

Decrease contractility due to decrease permeability to Ca++ ions.

Increase rhythmicity due to decrease permeability to Na & Ca++ ions.

Decrease conductivity due to increase permeability to K+ ions at A-V node.

Increase excitability due to increase permeability to Na* & Cat ions. (correct)

What effect do sympathetic nerves have on coronary arteries?

Causes plaque buildup in the arteries

Vasodilatation (correct)

Vasoconstriction

No effect on the coronary arteries

How does sympathetic stimulation impact the cardiac muscle's O2 consumption?

No change in O2 consumption

Causes cessation of O2 consumption

Increase of O2 consumption (correct)

Decrease of O2 consumption

What ion's permeability is increased at the A-V node by sympathetic cardiac nerves?

<p>Na* ions</p> Signup and view all the answers

How does sympathetic stimulation affect the contractility of the cardiac muscle?

<p>Increase contractility due to increase permeability to Ca++ ions.</p> Signup and view all the answers

Functions of Sympathetic Cardiac Nerves

Choose a study mode

Podcast

Questions and Answers

What is the main effect of sympathetic nerves on the cardiac muscle?

What effect do sympathetic nerves have on coronary arteries?

How does sympathetic stimulation impact the cardiac muscle's O2 consumption?

What ion's permeability is increased at the A-V node by sympathetic cardiac nerves?

How does sympathetic stimulation affect the contractility of the cardiac muscle?

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