Activation of the parasympathetic branch of the autonomic nervous system 4) incr
ID: 204309 • Letter: A
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
Option 1 is the correct answer. Activation of parasympathetic branch of the autonomic nervous system releases acetlcholine. Acetylcholine enhances salivation and peristaltic movement which results in better digestion. Saliva contain enzymes responsible for digestion and peristaltic movement passes the food efficiently in digestive tract.
Option 3rd is the correct answer. Action potential works on the all or none concept. The all-or-none law is the principle that the strength by which a nerve or muscle fiber responds to a stimulus is independent of the strength of the stimulus. If that stimulus exceeds the thresholdpotential, the nerve or muscle fiber will give a complete response; otherwise, there is no response. If the stimulus strength is increased, the size of the action potential does not get large.
Option 4th is correct. The order of event will be as follows: An action potential depolarizes the terminal membrane - Ca+2 rush in - neurotransmitter is released - ligand gated ion channels open. Thus the third event will be: neurotransmitter is released.
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