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After successfully running into the cabin from the large, snarling, drooling grizzly bear that was headed in your direction, you pause to catch your breath and collect your wits. The physical symptoms you now experience are controlled by the a. parasympathetic branch Ob.central nervous system. OCc. neurotransmitter acetylcholine. O d. sympaihetic branch. QUESTION 3 During an action potential, which of the following occurs? O a. Neurotransmitters enter the axon through gaps in the myelin sheath. b. The electrical stimulation of the neuron must dip below-70 millivolts and remain so during the action potential. O c. Sodium ions are pumped out of the neuron into the synaptic cleft. O d. The molecular gates open to allow sodium ions into the neuron

Answer :

Parrain

Answer: First Question.

A. PARASYMPATHETIC BRANCH

Second Question (Question 3)

D. THE MOLECULAR GATES OPEN TO ALLOW SODIUM IONS INTO THE NEURON

Explanation:

PARASYMPATHETIC BRANCH

The Parasympathetic Nervous which at times is referred to as the "rest and digest" system is one of 3 divisions in the Autonomic Nervous System.

It conserves energy as it slows the heart and increases intestinal and gland activity. It essentially takes over when one relaxes from an exciting ordeal.

ACTION POTENTIAL

During an Action Potential, a part of the neural membrane/ molecular gates open up to allow positively charged ions inside the cell and negative ones out.

With sodium being a positive ion, channels open up and positive sodium cells surge into the cell in preparation for an electrical signal being sent down the axon once a threshold has been reached.

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