Multiple Choice
In the human brain, what is the approximate ratio of glial cells to neurons?
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45. Nervous System
Neurons and Action Potentials
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Which of the following best describes the function of a motor neuron (indicated by the letter A) in the nervous system?
A
It connects sensory and motor neurons within the spinal cord.
B
It receives sensory information from the environment and sends it to the brain.
C
It produces myelin to insulate axons in the peripheral nervous system.
D
It transmits impulses from the central nervous system to muscles or glands.
Verified step by step guidance1
Step 1: Understand the role of motor neurons in the nervous system. Motor neurons are specialized cells responsible for transmitting signals from the central nervous system (CNS) to effector organs such as muscles or glands.
Step 2: Differentiate motor neurons from other types of neurons. Sensory neurons transmit information from the environment to the CNS, while interneurons connect sensory and motor neurons within the spinal cord. Motor neurons specifically carry signals from the CNS to effectors.
Step 3: Analyze the options provided in the question. Eliminate choices that describe functions unrelated to motor neurons, such as producing myelin (a function of Schwann cells) or receiving sensory information (a function of sensory neurons).
Step 4: Focus on the correct description of motor neurons. Motor neurons transmit impulses from the CNS to muscles or glands, enabling movement or secretion in response to signals from the brain or spinal cord.
Step 5: Confirm the correct answer based on the definition and function of motor neurons. The correct answer is: 'It transmits impulses from the central nervous system to muscles or glands.'
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