The binding of the neurotransmitter epinephrine, released by ---------------- postganglionic terminals, to Beta-1 adrenergic receptors, acts to ----------- the depolarization rate of myocardial conducting cells. Parasympathetic; slow Parasympathetic; increase Sympathetic; slow Sympathetic; increase
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The action potentials from the sympathetic neurons_________, while the action potentials from the parasympathetic neurons _________. Select one: a. increase heart rate but do not affect heart contraction strength; decrease heart rate but do not affect heart contraction strength b. increase heart rate and contraction strength; decrease heart rate and contraction strength c. decrease heart contraction and contraction strength; increase heart rate and contraction strength d. increase heart rate and contraction strength; decrease heart rate but do not affect heart contraction strength
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