Endorphins are found where neurons meet skeletal muscles. less powerful than enkaphalins. pain-controlling chemicals. radically different in function from neurotransmitters. responsible for the fatal reaction that human beings have when bit by a black widow spider.

Endorphins are "pain-controlling chemicals".

Explanation:

Endorphins are endogenous opioid neuropeptides and peptide hormones in individuals and other animals. They are shaped and deposited in the pituitary gland. The organization of particles as endorphins is founded on their pharmacological action, as different to a exact chemical preparation. Stress and pain are the two most mutual issues foremost to the issue of endorphins. Endorphins cooperate with the opiate receptors in the brain to condense our insight of pain and act likewise to drugs such as morphine and codeine.