Although the heart beats without nervous innervation, ________ can modify the heart rate
A) hormones
B) various chemicals and ions
C) impulses from the autonomic nerves
D) impulses from the autonomic nerves, hormones, and various chemicals and ions
Answer: D
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A) exiting the cell must overcome the potassium entering B) exiting the cell must overcome the potassium exiting C) entering the cell must overcome the potassium exiting D) entering the cell must overcome the potassium entering
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