Activation of the parasympathetic branch of the autonomic nervous system 4) incr

Question

Activation of the parasympathetic branch of the autonomic nervous system

4) increases heart rate.

__________

Which of the following statements is true?

_______

When the events at the neuromuscular junction listed in the answer choices are put in proper sequence, the third event is

1) enhances digestion. 2) causes conversion of glycogen to glucose. 3) triggers release of epinephrine.

4) increases heart rate.

__________

Which of the following statements is true?

Membrane potentials are found only in neurons. Action potential propagation requires voltage-gated and ligand-gated ion channels. Action potential height is independent of the strength of neuron stimulation. Action potentials alter ion concentration gradients across the nerve cell membrane.

Explanation / Answer

Activation of the parasympathetic branch of the autonomic nervous system triggers release of epinephrine.

Explanation:

The parasympathetic nervous system(PNS) is a part of autonomic nervous system(ANS) that activates fight and flight response during emotional situations.Activated PNS ,on prolonged exposure to stimulus triggers the release of adrenaline(epinephrine) from adrenal medulla.It is this epinephrine hormone that when released into blood causes increased heart rate,blood pressure,metabolism and muscle contractions during strong emotions.

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