Neuroglial cells support and provide nutrition for the ________.

Correct Answer: C

Rationale: Neuroglial cells, also known as glial cells, are non-neuronal cells that provide support and nutrition to neurons. They play essential roles in maintaining homeostasis, forming myelin sheaths, and protecting neurons from damage. Types of neuroglial cells include astrocytes, oligodendrocytes, microglia, and Schwann cells. These cells ensure the proper functioning of the nervous system by creating a supportive environment for neurons.

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: A

Rationale: A neuron consists of three basic parts: the cell body, dendrites, and axon. The axon is a long, slender projection that transmits nerve impulses away from the cell body to other neurons or target cells. Myelin is a protective sheath around some axons, the pons is a part of the brainstem, and the dura mater is a meningeal layer. Therefore, axon is the correct answer as it is one of the fundamental components of a neuron.

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.