Question

question 3
this reflex pertains to pain, where the patient pulls back.
withdrawal
plantar
abdominal
crossed extensor
question 4
which neuroglial cell would you expect to help prevent leakage in the blood-brain barrier and provide structural support?
schwann
ependymal
astrocyte
oligodendrocyte

Explanation:

Question 3

The withdrawal reflex is a spinal reflex that occurs in response to pain (or noxious stimuli), causing the body part (like a limb) to pull back to avoid harm. The plantar reflex is related to foot sole stimulation (e.g., Babinski sign context), abdominal reflex involves abdominal muscle contraction with skin stroking, and crossed extensor reflex is a postural reflex (e.g., when one leg is withdrawn, the other extends for balance). So the reflex for pain - induced pulling back is withdrawal.

Schwann cells are in the peripheral nervous system, forming myelin sheaths around peripheral axons. Ependymal cells line the ventricles of the brain and central canal of the spinal cord, involved in cerebrospinal fluid production. Astrocytes are neuroglial cells in the central nervous system; they help maintain the blood - brain barrier (preventing leakage between blood and brain tissue) and provide structural support to neurons. Oligodendrocytes form myelin sheaths around axons in the central nervous system. So the cell that helps prevent blood - brain barrier leakage and provides structural support is astrocyte.

Answer:

A. withdrawal

Question 4