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In an introductory anatomy and physiology context, the peripheral nervous system (PNS) consists primarily of which structures?
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13. The Peripheral Nervous System
Introduction to the Peripheral Nervous System
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In the peripheral nervous system, which functional classification of neurons carries signals from the central nervous system to initiate skeletal muscle contraction and activate glands?
A
Pseudounipolar neurons
B
Sensory (afferent) neurons
C
Interneurons (association neurons)
D
Motor (efferent) neurons
Guida verificata passo dopo passo1
Step 1: Understand the functional classifications of neurons in the peripheral nervous system (PNS). There are primarily sensory (afferent) neurons, motor (efferent) neurons, and interneurons (association neurons).
Step 2: Recognize that sensory (afferent) neurons carry signals from sensory receptors toward the central nervous system (CNS), meaning they transmit incoming information.
Step 3: Know that interneurons (association neurons) are located entirely within the CNS and serve to process and integrate information between sensory and motor neurons.
Step 4: Identify that motor (efferent) neurons carry signals away from the CNS to effector organs such as skeletal muscles and glands, initiating actions like muscle contraction and gland activation.
Step 5: Conclude that the neurons responsible for carrying signals from the CNS to initiate skeletal muscle contraction and activate glands in the PNS are motor (efferent) neurons.
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