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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.
Mechanisms that Affect the Heart Rate Two different mechanisms affect the heart rate. Nerve impulse to the pacemaker region and hormonal influences. A branch of the vagues ner
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