alpha-receptor

noun al·pha-re·cep·tor \ ˈal-fə-ri-ˌsep-tər \

Definition of alpha-receptor

: any of a group of receptors that are present on cell surfaces of some effector organs and tissues innervated by the sympathetic nervous system and that mediate certain physiological responses (such as vasoconstriction, relaxation of intestinal muscle, and contraction of most smooth muscle) when bound by specific adrenergic agents — compare beta-receptor

First Known Use of alpha-receptor

1948

in the meaning defined above

See Words from the same year
NEW! Time Traveler

Medical Dictionary

alpha-receptor

noun al·pha-re·cep·tor \ ˈal-fə-ri-ˌsep-tər \

medical Definition of alpha-receptor

: any of a group of receptors that are present on cell surfaces of some effector organs and tissues innervated by the sympathetic nervous system and that mediate certain physiological responses (as vasoconstriction, relaxation of intestinal muscle, and contraction of most smooth muscle) when bound by specific adrenergic agents — compare beta-receptor

Seen and Heard

What made you want to look up alpha-receptor? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

a simultaneous discharge of guns

Get Word of the Day daily email!

Test Your Vocabulary

Test Your Emoji Exceptionalism

  • test-your-emoji-exceptionalism-written-with-a-lot-of-emoji
  • What is this emoji intended to represent: 🤳
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!