Curare is a poisonous plant extract.Curare molecules have a chemical structure like the neurotransmitter ACh.Curare can bind to the ACh receptor site on the chemically gated ion channels in the motor end plate.Even though curare will bind to the receptor site it will not open the ion channel and no ions will pass through.What do you think the symptoms of curare poisoning would look like?
A) Curare will only affect muscles with ACh receptors, paralyzing them.
B) Smooth muscles will become stimulated causing quick movement of nutrients through the digestive system.
C) Curare will only affect cardiac muscle, causing fibrillations of the heart.
D) Muscles will respond too quickly and cause a severe tremor.

Question

Quizplus · Accepted Answer

Curare will bind to the ACh receptor site on the motor end plate, preventing the binding of ACh and causing paralysis of the affected muscles. Smooth muscles and cardiac muscles do not have ACh receptors in the motor end plate, so they will not be affected by curare. A severe tremor would be a result of muscles responding too quickly, which is not the case with curare poisoning.

Curare Is a Poisonous Plant Extract