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Questions and Answers
What is the main effect of sympathetic nerves on the cardiac muscle?
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?
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?
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?
What ion's permeability is increased at the A-V node by sympathetic cardiac nerves?
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How does sympathetic stimulation affect the contractility of the cardiac muscle?
How does sympathetic stimulation affect the contractility of the cardiac muscle?
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