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

Multiple Choice

During a rest stop while hiking, Phil was bitten by a black widow spider. Shortly after being bitten, he started having breathing difficulties, 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.