Scopolamine Is a Muscarinic Antagonist That Acts by Blocking Muscarinic

Multiple Choice

Scopolamine is a muscarinic antagonist that acts by blocking muscarinic acetylcholine receptors. Although it is not clear how scopolamine prevents nausea and vomiting due to motion sickness, which statement below best describes the mechanism of action for this drug?

A) Scopolamine works by preventing calcium influx at the axon terminal, therefore preventing the release of neurotransmitter.
B) Scopolamine works on the optic nerve blocking sodium channels so that the sight of motion does not make an individual sick.
C) Scopolamine causes chloride channels to open causing a subthreshold graded potential in the soma of the cell and, therefore, no action potential is ever generated that may cause motion sickness.
D) Scopolamine prevents communication between the nerves of the vestibule and the vomiting center in the brain by blocking the action of acetylcholine.
E) Scopolamine breaks down acetylcholine in the synaptic cleft, therefore blocking the drug from entering the neuron.