PATHOLOGY

Detailed explanation-1: -The nervous system uses electrical and chemical means to help all parts of the body to communicate with each other. The brain and spinal cord make up the central nervous system. Nerves everywhere else in the body are part of the peripheral nervous system.

Detailed explanation-2: -As with the central nervous system, the basic cell units of the peripheral central nervous system are neurons. Each neuron has a long process, known as the axon, which transmits the electrochemical signals through which neurons communicate.

Detailed explanation-3: -Answer and Explanation: The correct answer is D. spinal cord. The spinal cord is part of the CNS and not the PNS.

Detailed explanation-4: -They make up about 99% of all neurons and have two main functions: They are located between afferent and efferent neurons, and therefore work to integrate all the information and response from these neurons together.