(physiology) metabolic equilibrium actively maintained by several complex biological mechanisms that operate via the autonomic nervous system to offset disrupting changes
thrown into a state of intense fear or desperation; "became panicky as the snow deepened"; "felt panicked before each exam"; "trying to keep back the panic-stricken crowd"; "the terrified horse bolted"
in fear or dread of possible evil or harm; "apprehensive for one's life"; "apprehensive of danger"
mentally upset over possible misfortune or danger etc; "apprehensive about her job"; "not used to a city and worried about small things"; "felt apprehensive about the consequences"
quick to understand; "a kind and apprehensive friend"- Nathaniel Hawthorne