5 Questions
What is the main effect of sympathetic nerves on the cardiac muscle?
Increase excitability due to increase permeability to Na* & Cat ions.
What effect do sympathetic nerves have on coronary arteries?
Vasodilatation
How does sympathetic stimulation impact the cardiac muscle's O2 consumption?
Increase of O2 consumption
What ion's permeability is increased at the A-V node by sympathetic cardiac nerves?
Na* ions
How does sympathetic stimulation affect the contractility of the cardiac muscle?
Increase contractility due to increase permeability to Ca++ ions.
This quiz covers the functions of sympathetic cardiac nerves, including stimulation of cardiac muscle properties such as excitability, rhythmicity, conductivity, and contractility. It also includes topics like vasodilatation of the coronary arteries and increase in oxygen consumption.
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