ATI RN
Questions About the Nervous System Questions
Question 1 of 5
The fastest conduction of impulses occurs in nerves of type:
Correct Answer: B
Rationale: A-alpha fibers (B) are the fastest (70-120 m/s), myelinated, and large-diameter, used in motor and proprioception. C fibers (A) are slow (0.5-2 m/s), unmyelinated. A-beta (C) and A-delta (D) are intermediate. B is correct.
Question 2 of 5
Aside from the nervous system, which other organ system develops out of the ectoderm?
Correct Answer: C
Rationale: The ectoderm gives rise to the nervous system and the integumentary system (skin, hair, nails) (C). The digestive (A) and respiratory (B) systems primarily develop from the endoderm, while the urinary (D) system arises from the mesoderm and endoderm. C is correct.
Question 3 of 5
What region of the spinal cord contains motor neurons that direct the movement of skeletal muscles?
Correct Answer: A
Rationale: The anterior horn (A) contains somatic motor neurons controlling skeletal muscles. The posterior horn (B) processes sensory input, lateral horn (C) houses autonomic neurons, and alar plate (D) is an embryonic term region, not adult structure. A is correct.
Question 4 of 5
What type of ganglion contains neurons that control homeostatic mechanisms of the body?
Correct Answer: C
Rationale: Autonomic ganglia (C) contain neurons regulating homeostasis (e.g., heart rate, digestion) via the autonomic nervous system. Sensory (A) and dorsal root ganglia (B) handle sensation, and cranial nerve ganglia (D) vary. C is correct.
Question 5 of 5
Which term describes a bundle of axons in the peripheral nervous system?
Correct Answer: D
Rationale: In the peripheral nervous system (PNS), a bundle of axons is called a nerve. A nucleus refers to a cluster of cell bodies in the CNS, a ganglion is a cluster of cell bodies in the PNS, and a tract is a bundle of axons in the CNS.