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Multiple Choice
Which of the following is NOT a component of a typical visceral reflex arc?
A
Sensory receptor
B
Integration center
C
Effector organ
D
Somatic motor neuron
Verified step by step guidance
1
Step 1: Understand the concept of a visceral reflex arc. A visceral reflex arc is an automatic response involving the autonomic nervous system, which controls involuntary functions such as heart rate, digestion, and glandular activity.
Step 2: Identify the typical components of a visceral reflex arc. These include: (1) a sensory receptor that detects a stimulus, (2) a sensory neuron that transmits the signal to the central nervous system, (3) an integration center in the central nervous system where the signal is processed, (4) a motor neuron (autonomic motor neuron) that carries the response signal, and (5) an effector organ that carries out the response.
Step 3: Compare the listed options to the components of a visceral reflex arc. Sensory receptor, integration center, and effector organ are all part of the reflex arc. However, somatic motor neurons are involved in voluntary control of skeletal muscles, not in autonomic or visceral reflexes.
Step 4: Recognize that somatic motor neurons are part of the somatic nervous system, which controls voluntary movements, and are therefore not a component of a visceral reflex arc.
Step 5: Conclude that the correct answer is 'Somatic motor neuron,' as it does not belong to the components of a typical visceral reflex arc.