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A decrease in parasympathetic discharge to the heart leads to
A. a decrease in the conductance of F-channels in SA node cells.
B. an increase in the conductance of potassium channels associated with muscarinic ACh receptors in SA node cells.
C. an increase in the amount of ACh (acetylcholine) released near SA node cells of the heart.
Conduction in Myelinated Axons The myelin sheath provides insulation for the axon preventing movements of Na + and K + through the membrane. Therefore, if this myelin sheath
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