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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.
Development of Heart in Amphibians The heart and the surrounding pericardial cavity build up from lateral mesoderm. After gastrulation, the mesodermal mantles carry on to gro
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