a small peptide released upon stimulation in the nervous system and involved in regulation of the pain threshold.
substance P n.
A short-chain polypeptide that functions as a neurotransmitter especially in the transmission of pain impulses from peripheral receptors to the central nervous system.
adjective 1. below standard or less than adequate: substandard housing conditions. 2. noting or pertaining to a dialect or variety of a language or a feature of usage that is often considered by others to mark its user as uneducated; nonstandard. 3. Insurance. not measuring up to an insurer’s regular standards in undertaking risks: a […]
substantia sub·stan·ti·a (sŭb-stān’shē-ə) n. pl. -ti·æt (-shē-ē’) Substance.
- Substantia alba
substantia alba substantia al·ba (āl’bə) n. See white matter.