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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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Supersaiyan Supersaiyan
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10 years ago Edited: 10 years ago, Supersaiyan
How do the synapses of the autonomic nervous system differ from a neuromuscular junction (NMJ)?

Chapter Test - Chapter 11 Question 13

A. Synapses of the somatic motor system receive input from the brain, whereas the autonomic nervous system signaling originates in the spinal cord.

B. Neurotransmitter receptors are concentrated on the postsynaptic membrane in the NMJ, but diffusely arranged across the tissue in a varicosity.

C. There is no effective way of blocking (antagonizing) the effects of the autonomic nervous system while blocking the somatic motor system is relatively easy.

D. The neurotransmitters used are very different between the two systems.
Post Merge: 10 years ago

I forgot to mention that this question was from a Mastering A & P (anatomy and physiology) quiz. I don't know what book it came from. I think Silverthorne 6E?
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#1
Staff Member
10 years ago
The neuromuscular junction connects the nervous system to the muscular system via synapses between efferent nerve fibers and muscle fibers, also known as muscle cells. As an action potential reaches the end of a motor neuron, voltage-dependent calcium channels open allowing calcium to enter the neuron. Calcium binds to sensor proteins on synaptic vesicles triggering vesicle fusion with the plasma membrane and subsequent neurotransmitter release from the motor neuron into the synaptic cleft.
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Supersaiyan Author
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#2
10 years ago Edited: 10 years ago, Supersaiyan
Quote from: duddy (10 years ago)
The neuromuscular junction connects the nervous system to the muscular system via synapses between efferent nerve fibers and muscle fibers, also known as muscle cells. As an action potential reaches the end of a motor neuron, voltage-dependent calcium channels open allowing calcium to enter the neuron. Calcium binds to sensor proteins on synaptic vesicles triggering vesicle fusion with the plasma membrane and subsequent neurotransmitter release from the motor neuron into the synaptic cleft.
I'm sorry but I still don't understand how that compares to the autonomic nervous system's synapses.
Post Merge: 10 years ago


Quote from: duddy (10 years ago)
The neuromuscular junction connects the nervous system to the muscular system via synapses between efferent nerve fibers and muscle fibers, also known as muscle cells. As an action potential reaches the end of a motor neuron, voltage-dependent calcium channels open allowing calcium to enter the neuron. Calcium binds to sensor proteins on synaptic vesicles triggering vesicle fusion with the plasma membrane and subsequent neurotransmitter release from the motor neuron into the synaptic cleft.

This part in particular sounds exactly like a regular synapse.
rsb
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#3
10 years ago
Neurotransmission in the autonomic nervous system differs in some ways from the neuromuscular junction, e.g. in the importance of volume transmission, the spectrum of receptors, and the variety of co-transmitters.
Supersaiyan Author
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#4
10 years ago
Sorry, I get what you said but it doesn't help me with this problem. Are the neurotransmitters used very different between the two systems?
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#5
Staff Member
10 years ago
Quote from: Supersaiyan (10 years ago)
B. Neurotransmitter receptors are concentrated on the postsynaptic membrane in the NMJ, but diffusely arranged across the tissue in a varicosity.
- Master of Science in Biology
- Bachelor of Science
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