If an organic nerve toxin (acting at the neuromuscular junction) renders the ion channel of postsynaptic acetylcholine receptors permanently open, the toxin would be most likely to:

The answer is convulsions. This occurs when there are continuous involuntary contraction and relaxation of muscle of the body as a result of a continuous unchecked transmission of impulse by neurons to the muscles. This can only occur if the ion channels of the neurons are continually kept open, such as by the toxin in this case.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.