Question

question 18
1 pts
which of the following refers to a time when a neuron does not allow sodium to pass through the neuronal membrane and as a result, is insensitive to messages from other neurons and does not fire?
○ the resting period
○ a temporary threshold shift
○ a refractory period
○ the resistance stage

Explanation:

• The resting period is when the neuron is at rest, but sodium can still potentially move in certain contexts, and it's not about insensitivity to firing.
• A temporary threshold shift is about a change in the threshold for firing, not about sodium permeability and insensitivity to firing.
• The refractory period (specifically the absolute refractory period) is when the neuron cannot fire again because sodium channels are inactivated and do not allow sodium to pass, making it insensitive to stimuli and unable to fire.
• The resistance stage is related to the general adaptation syndrome in stress, not neuronal firing.

Answer:

C. a refractory period