Question

which part of the nervous system is primarily affected by polio? white blood cells in the muscles motor neurons in the spinal cord neural pathways in the brain

Explanation:

Polio (poliomyelitis) is a viral disease that primarily affects motor neurons in the spinal cord. These motor neurons are responsible for controlling muscle movement. White blood cells are part of the immune system, not the nervous system, so the first option is incorrect. Polio mainly targets the spinal cord's motor neurons rather than neural pathways in the brain, so the third option is also incorrect.

Answer:

B. motor neurons in the spinal cord