Drugs are often used to relax muscles during surgery. Which of th...

Question

Drugs are often used to relax muscles during surgery. Which of the following chemicals do you think would make a better muscle relaxant, and why? Chemical A: Blocks acetylcholine receptors on muscle cells. Chemical B: Floods the cytoplasm of muscle cells with calcium ions.

Accepted Answer

Hi everyone. Welcome back. Let's look at our next question. Which of the following neurotransmitters is released by motor neurons at the neuro muscular junction? Well the neurotransmitter that's released by those motor neurons of the neuro muscular junction is choice A acetylcholine. And that's because acetylcholine is released to cause muscle contractions. So it's the neurotransmitter released by the motor neurons at that neuromuscular junction as part of its role in muscle contractions. Let's look through other answer choices. See why they're not correct. Choice B is gaba or gamma amino butyric acid and it is also a neurotransmitter but it actually inhibits nerve transmission to reduce neuronal excitability. It has anti seizure and anti anxiety effects and that it sort of slows the brain down in essence, but not what we're looking for. So not our answer here then we have choice. C, serotonin and serotonin perhaps most famous for its involvement in depression. It helps to regulate attention behavior, body temperature, mood and digestion strangely enough. But not part of this motor neuron uh muscle contraction activity. So not our answer choice. And finally our last choice d here dopamine dopamine, kind of another famous neurotransmitter. Um It has a role in pleasure, motivation and learning but again not part of that motor neuron system there. So not our answer choice. So the neurotransmitter released by motor neurons at the neuro muscular junction is choice a acetylcholine. See you in the next video

Drugs are often used to relax muscles during surgery. Which of the following chemicals do you think would make a better muscle relaxant, and why? Chemical A: Blocks acetylcholine receptors on muscle cells. Chemical B: Floods the cytoplasm of muscle cells with calcium ions.

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