Consider the arrival of a single excitatory presynaptic signal at a single chemical synapse. What is the difference between the magnitude of the postsynaptic graded potential at a vertebrate neuromuscular junction and at a neuron-to-neuron synapse, and why does it matter?

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.

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