The activity of the heart depends on both the inherent properties of the cardiac muscle cells and

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The activity of the heart depends on both the inherent properties of the cardiac muscle cells and the activity of the autonomic nerves to the heart. Therefore, 

a. Cutting all of the autonomic nerves to the heart produces a decrease in resting heart rate. 

b. Blocking the parasympathetic nerves to the heart decreases the heart rate.

c. Stimulating the sympathetic nerves to the heart increases the time available to fill the ventricles during diastole. 

d. The heart rate will increase in cases of dehydration, which will lead to less filling time.  

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