Multiple Choice
Mechanoreceptors located in the skin and mucous membranes are called ______ receptors.
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13. The Peripheral Nervous System
Introduction to Sensory Receptors
4:22 minutesProblem 12
Textbook Question
Which of the following is true of the autonomic, but not the somatic, nervous system?
a. Neurotransmitter is acetylcholine
b. Axons are myelinated
c. Effectors are muscle cells
d. It has motor neurons located in ganglia
Verified step by step guidance1
Step 1: Understand the difference between the autonomic and somatic nervous systems. The autonomic nervous system (ANS) controls involuntary functions like heart rate, digestion, and glandular activity, while the somatic nervous system (SNS) controls voluntary movements of skeletal muscles.
Step 2: Analyze each option provided in the question. For example, option (a) states that the neurotransmitter is acetylcholine. While acetylcholine is used in both the autonomic and somatic systems, the autonomic system also uses other neurotransmitters like norepinephrine, depending on the division (sympathetic or parasympathetic).
Step 3: Evaluate option (b), which states that axons are myelinated. Both the autonomic and somatic systems can have myelinated axons, but the autonomic system also has unmyelinated axons in postganglionic neurons.
Step 4: Consider option (c), which states that effectors are muscle cells. The somatic system targets skeletal muscle cells, while the autonomic system targets smooth muscle, cardiac muscle, and glands. This distinction is key to understanding the difference.
Step 5: Examine option (d), which states that motor neurons are located in ganglia. This is true for the autonomic nervous system, as it has a two-neuron chain (preganglionic and postganglionic neurons) with synapses occurring in ganglia. The somatic system does not have motor neurons located in ganglia.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Autonomic Nervous System
The autonomic nervous system (ANS) regulates involuntary bodily functions, such as heart rate, digestion, and respiratory rate. It operates without conscious control and is divided into the sympathetic and parasympathetic systems, which work to maintain homeostasis. Understanding the ANS is crucial for distinguishing its functions from those of the somatic nervous system.
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Somatic vs. Autonomic Nervous System
Somatic Nervous System
The somatic nervous system (SNS) is responsible for voluntary movements and the transmission of sensory information to the central nervous system. It primarily controls skeletal muscles and is characterized by myelinated axons that facilitate rapid signal transmission. Recognizing the differences between the SNS and ANS helps clarify their distinct roles in the nervous system.
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Neurotransmitters and Ganglia
Neurotransmitters are chemical messengers that transmit signals across synapses between neurons. In the ANS, acetylcholine is a key neurotransmitter, particularly in the parasympathetic division. Additionally, the ANS has motor neurons located in ganglia, which are clusters of nerve cell bodies outside the central nervous system, contrasting with the direct pathways of the SNS.
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