Question

For a hair cell of the organ of corti to depolarize which of the following must open?

a) sodium ligand-gated channel

b) potassium ligand-gated channel

c) potassium mechanically-gated channel

d) sodium voltage gated channel

e) potassium voltage gated-channel

2) which of the following is Not true concerning the ANS (autonomic nervous system)?
a) the sympathetic division originates from the brainstem

b) it utilizes ganglia

c) parasympathetic axons are found in cranial nerve X (vagus)

d) it always involves preganglionic and postganglionic neuron

e) it is an involuntary motor system

Answer 1

Ans1:- c) potassium mechanically-gated channel

Mechanoelectrical transduction

When tension increases, the flow of ions across the membrane into the hair cell rises as well. Such influx of ions causes a depolarization of the cell, resulting in an electrical potential that ultimately leads to a signal for the auditory nerve and the brain

Ans:- a) the sympathetic division originates from the brainstem

Option is incorrect.

Parasympathetic nervous system arise from brain stem.

Sympathetic nerves originate inside the vertebral column, toward the middle of the spinal cord in the intermediolateral cell column (or lateral horn), beginning at the first thoracic segment of the spinal cord and are thought to extend to the second or third lumbar segments.