Examlex
The Lewis structure of PF3 shows that the central phosphorus atom has ________ nonbonding and ________ bonding electron pair(s) .
Nervous System
The network of nerve cells and fibers that transmits nerve impulses between parts of the body, responsible for regulating and coordinating body activities.
Endorphins
Neurochemicals in the brain that act as natural painkillers and also boost pleasure, creating feelings of well-being.
Pain-Controlling Chemicals
Substances produced by the body, such as endorphins, that naturally reduce pain through their action on the nervous system.
Body
The physical structure of a person or an organism, including bones, flesh, and organs.
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