After diffusion across the synaptic cleft, acetylcholine immediately causes ____

Question

After diffusion across the synaptic cleft, acetylcholine immediately causes _____________ in the postsynaptic neurons' plasma membrane.

A. the opening of ligand-gated sodium and potassium ion channels

B. hyperpolarization

C. the opening of voltage-gated sodium and potassium ion channels

D. inhibition

E. the closing of ligand-gated sodium and potassium ion channels

Which of the following will cause the plasma membrane to hyperpolarize?

A. Opening of sodium ion channels only

B. Opening of potassium channels only

C. Inflow of sodium

D. Inflow of potassium

Consider the following scenario. The biceps brachii tendon in the anterior elbow region is hit by a reflex hammer and subsequently contracts. This reflex is __________.

A. an example of the tendon reflex

B. monosynaptic

C. contralateral

D. intersegmental

E. polysynaptic

Explanation / Answer

Question 1

Answer is C ,Opening of voltage gated sodium channels and potassium channels. The first depolarization is caused by inflow of sodium ions and then closed and opening of voltage gated potassium channels causes repolarization.

Question 2

Answer B, opening of potassium channels only. The slow opeing and closing of potassium channels causes hyperpolarization.

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