The Peripheral Nervous System is made up of the:

Correct Answer: B

Rationale: The peripheral nervous system (PNS) includes all the nerves outside the central nervous system, such as spinal nerves and cranial nerves. It connects the CNS to the limbs, organs, and skin, allowing for the transmission of sensory and motor signals. The PNS is divided into the somatic nervous system, which controls voluntary movements, and the autonomic nervous system, which regulates involuntary functions like heart rate and digestion.

Correct Answer: C

Rationale: Neurotransmitters are chemical substances released at axonal endings to propagate nervous impulses across synapses. Ions and the sodium-potassium pump are involved in generating action potentials, while nerve glue and action potentials are not substances released at axonal endings. Thus, C is the correct answer.

Correct Answer: A

Rationale: The sympathetic nervous system prepares the body for 'fight-or-flight' responses during threatening situations by increasing heart rate, dilating pupils, and redirecting blood flow. The parasympathetic nervous system has the opposite effect, while the cerebrum, somatic nervous system, and afferent nervous system are not primarily responsible for this response. Thus, A is the correct answer.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: The ventricular proliferative zone is a region of active cell division located in the neural tube. It gives rise to neurons and glial cells during nervous system development. This zone is essential for generating the vast number of cells required to form the complex structure of the brain and spinal cord.