ATI RN
Questions About the Nervous System Questions
Question 1 of 5
How do neurons communicate with one another?
Correct Answer: D
Rationale: Neurons communicate electrically within the cell (via action potentials) and chemically between cells (via neurotransmitters at synapses). 'Radio-wave-like impulses' is incorrect, so 'A and B' is the accurate choice.
Question 2 of 5
A network of billions of neurons and even more neuroglia that is organized into two main divisions: central nervous system (brain and spinal cord) and peripheral nervous system (nerves, ganglia, enteric plexuses, and sensory receptors outside the central nervous system).
Correct Answer: A
Rationale: The nervous system comprises the CNS (brain, spinal cord) and PNS (nerves, ganglia, enteric plexuses, receptors), including neurons and neuroglia. White matter is axons, muscle action potential is specific, and cerebral cortex is part of the CNS.
Question 3 of 5
The 12 pairs of nerves that emerge from the brain and primarily serve the head and neck.
Correct Answer: B
Rationale: Cranial nerves are 12 pairs emerging from the brain, serving head and neck functions. Synapse is a junction, gray matter is CNS tissue, and neuropathy is a disorder.
Question 4 of 5
A hormone secreted by the adrenal medulla that produces actions similar to those that result from sympathetic stimulation.
Correct Answer: D
Rationale: Norepinephrine (NE), secreted by the adrenal medulla, mimics sympathetic effects (e.g., increased heart rate). ACh is a neurotransmitter, receptors bind signals, and microtubules are structural.
Question 5 of 5
This multilayered lipid and protein covering, formed by Schwann cells and oligodendrocytes, around axons of many peripheral and central nervous system neurons.
Correct Answer: A
Rationale: The myelin sheath, formed by Schwann cells (PNS) and oligodendrocytes (CNS), insulates axons for faster conduction. Nerve is broader, neuroblastoma is a tumor, and neurons are cells.