Question

during the neurons resting potential (before an action potential), its state is __________. during the refractory period (after the action potential), the neurons state is __________.
negatively charged; positively charged
polarized; hyperpolarized
depolarized; polarized
hyperpolarized; polarized
question 37 (1 point)
the wrinkling of the surface of the brain serves what purpose?
it increases blood flow that brings oxygen and nutrients to neurons.
it increases the surface area without increasing the size of the brain.
it allows heat to radiate away from the brain more effectively.
it cushions the brain and protects it from trauma.

Explanation:

• First Question:
• During the resting potential, the neuron is polarized (there is a difference in electrical charge across the membrane).
• During the refractory period (after an action potential), the neuron is hyperpolarized (more negative inside compared to the resting state).
• Second Question:
• The wrinkling (gyri and sulci) of the brain's surface increases the surface area without increasing the brain's size. This allows for more neurons (as the cerebral cortex, which has neurons, can be more extensive).

Answer:

• First Question: polarized; hyperpolarized
• Second Question: It increases the surface area without increasing the size of the brain.