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Question:

Which class of hormones is most likely to be released after a serious injury?

A Endorphins
Explaination

Endorphins are a special group of neurotransmitters. When an injury occurs, endorphins are released and are capable of reducing the severity of pain. They are also released during intense exercise and periods of intense relaxation. Acetylcholine, also a neurotransmitter, activates muscles and plays a role in attention and sensory perception. Oxytocin plays a crucial role in female reproduction. Luteinizing hormone plays an important role in female ovulation and testosterone production in males.