During a rest stop while hiking, Phil was bitten by a black widow spider. Shortly after being bitten he started having breathing difficulties and then experienced muscle spasms. The symptoms he experienced occurred because the black widow spider's venom:
A)blocked acetylcholine receptor sites on motor neurons.
B)blocked the release of serotonin from sending neurons.
C)shut down the functioning of the substantia nigra in Phil's brain.
D)caused acetylcholine to be continuously released by the motor neurons.

Question

Quizplus · Accepted Answer

The venom of a black widow spider causes muscle spasms and other symptoms because it leads to the continuous release of acetylcholine by motor neurons, which stimulates an excessive muscular contraction response.

During a Rest Stop While Hiking, Phil Was Bitten by a Black