When curare, a neuromuscular poison, is dropped onto an isolated muscle-nerve preparation in a laboratory, the muscle does not contract when the nerve is stimulated, even though neurotransmitter is released from the nerve cell. Why does this happen? How might this action of curare be lethal to an individual who has been poisoned?

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Q: So named beacause it acts under conscious control?

A: Conscious control means which is under the will or the control of the individual.

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Q: What effect does physostigmine have on smooth muscle contraction? a) no effect on the smooth muscle…

A: Hi, Thanks For Your Question.  Answer : Correct Option Is C (stimulates smooth muscle contraction).

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Substance Abuse

Substance abuse refers to the use of illegal drugs in excessive quantities, as well as the misuse of legal substances such as prescription or over-the-counter pharmaceuticals or alcohol for purposes other than those intended. Drug addiction, also known as substance use disorder, is a disease that affects the brain and behavior of a person. It leads to a failure to control the use of any drug or prescription, legal or illegal.