Question

question 67
0.25 pts
small distinct regions of gray matter in the cns are called:
○ nuclei.
○ tracts.
○ ganglia
○ axons.
question 68
0.25 pts
the efferent pathways of the autonomic nervous system consist of the ______ nervous systems.
○ peripheral and afferent
○ sympathetic and parasympathetic
○ sympathetic and efferent
○ parasympathetic and somatic
question 69
0.25 pts
the part of the nervous system that transmits impulses from the cns to the skeletal muscle is the:
○ somatic nervous system.
○ autonomic nervous system.
○ central nervous system.
○ afferent division.

Explanation:

Question 67

To solve this, we recall the definitions of each term:

• nuclei: Small distinct regions of gray matter in the central nervous system (CNS).
• tracts: Bundles of axons (white matter) in the CNS.
• ganglia: Clusters of neuron cell bodies in the peripheral nervous system (PNS).
• axons: Long projections of neurons that transmit electrical impulses, not regions of gray matter.

So the correct answer is the option with "nuclei".

The autonomic nervous system's efferent (motor) pathways are divided into two branches:

• sympathetic and parasympathetic: These are the two divisions of the autonomic nervous system's efferent pathways.
• "peripheral and afferent" is incorrect (afferent is sensory, not part of autonomic efferent).
• "sympathetic and efferent" is redundant (efferent is the type, not a division).
• "parasympathetic and somatic" is incorrect (somatic is a different nervous system division, not part of autonomic efferent).

So the correct answer is the option with "sympathetic and parasympathetic".

We analyze each option:

• somatic nervous system: Transmits impulses from the CNS to skeletal muscles (voluntary control).
• autonomic nervous system: Controls involuntary functions (smooth muscle, glands, cardiac muscle).
• central nervous system (CNS): Consists of brain and spinal cord, not the pathway to skeletal muscle.
• afferent division: Transmits sensory impulses to the CNS, not motor to skeletal muscle.

So the correct answer is the option with "somatic nervous system".

Answer:

A. nuclei (assuming the first option is labeled A, but based on the options, the correct one is the first option: nuclei)

Question 68