What effect would increasing the membrane resistance of the input region of a mo

Question

What effect would increasing the membrane resistance of the input region of a motor neuron have on

EPSPs in this region?

a. It would increase their amplitude.
b. It would decrease their amplitude.
c. It would decrease their duration.
d. It would change the threshold for their generation. e. b and c are correct.

22. The synapse between the _______ and the _______ requires muscarinic, metabotropic acetylcholine receptors.

a. postganglionic parasympathetic neuron, target
b. postganglionic sympathetic neuron, target
c. preganglionic parasympathetic neuron, postganglionic parasympathetic neuron

d. preganglionic sympathetic neuron, postganglionic sympathetic neuron
e. c and d are correct.

23. Which of the following is true for the anterolateral system which carries information about pain, temperature and pressure?

a. The axons of the primary afferent neurons ascend the cord on the same side where they enter.

b. The second order neurons have their cell bodies in the brain stem.
c. The conductile processes of the second order neurons cross over the midline in the brain stem.

d. The second order neurons have their neuronal cells bodies in the dorsal horn of the spinal cord. e. The second order neurons have their neuronal cell bodies in the dorsal root ganglion.

An EPSP (excitatory postsynaptic potential):

a. is stereotyped always reaching the same level of depolarization.

b. occurs when voltage-gated channels open.
c. has a threshold.
d. results from the opening of ligand-gated channels.
e. all except d are correct

Explanation / Answer

21) When the resistance of the input region of the motor neuron is increased, there will be a decrease in the amplitude of excitatory post synaptic potential (EPSP) as well as it's duration. This is because of decrease in the release of neurotransmitters as well as it's rapid removal. Thereby, the generation and propogation of action potential is prevented. So, the answer for this question is option e (b and c are correct).

Please post other questions separately.

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