The process of moving sodium ions into the axon to make the inside positive is called

Correct Answer: B

Rationale: Depolarization is Na+ influx making the inside positive, initiating an action potential. Polarization is resting state, repolarization restores it, and hyperpolarization overshoots.

Correct Answer: C

Rationale: The four major brain regions are brain stem, diencephalon (thalamus, hypothalamus), cerebrum, and cerebellum. Spinal cord is separate.

Correct Answer: C

Rationale: The primary somatosensory area (postcentral gyrus) in the parietal lobe processes touch, pressure, and pain.

Correct Answer: D

Rationale: The limbic system (e.g., amygdala, hippocampus) governs emotions, memory, and learning, making 'all of the above' correct.

Correct Answer: A

Rationale: The somatic nervous system (SNS) controls voluntary skeletal muscles, skin, joints, and tendons. Internal organs are autonomic.