cell receptors

(redirected from cell membrane receptors)

cell receptors

; cell membrane receptors protein structures within cell membranes, activated by ligands (i.e. drugs, enzymes, biochemicals or hormones) to cause a cell membrane or intracellular effect; receptor numbers rise and fall in response to local needs and demand, e.g. receptor upregulation occurs when ligand-driven demand increases, and vice versa
References in classic literature ?
They got on excellently, for Amy's chief care was soon set at rest by learning that the gentleman would leave first, and she was chatting away in a peculiarly lofty strain, when the old lady got out.
And, take it in the autumn, what can be pleasanter than to spend a whole day on the sunny side of a barn or a wood-pile, chatting with somebody as old as one's self; or, perhaps, idling away the time with a natural-born simpleton, who knows how to be idle, because even our busy Yankees never have found out how to put him to any use?
It was pleasant in the summer forenoons -- when the fervent heat, that almost liquefied the rest of the human family, merely communicated a genial warmth to their half torpid systems -- it was pleasant to hear them chatting in the back entry, a row of them all tipped against the wall, as usual; while the frozen witticisms of past generations were thawed out, and came bubbling with laughter from their lips.
In these last-mentioned haunts you see only sailors; but in New Bedford, actual cannibals stand chatting at street corners; savages outright; many of whom yet carry on their bones unholy flesh.
Her baby raised himself up against her, and stroked her cheeks with his little hands; and, springing up and down, crowing and chatting, seemed determined to arouse her.
Children munching oranges, six thousand fans fluttering and glimmering, everybody happy, everybody chatting gayly with their intimates, lovely girl-faces smiling recognition and salutation to other lovely girl-faces, gray old ladies and gentlemen dealing in the like exchanges with each other - ah, such a picture of cheery contentment and glad anticipation
Some of them were sipping wine, others were playing cards, others chess, other groups were chatting together, and many were smoking cigarettes while they waited for the coming duels.
Tom skimmed up the shore through the long twilight, chatting cheerily with Huck, and landed shortly after dark.
I was saying to madame, with whom I had the pleasure of chatting when you entered, that they tell me there is--and no wonder
Agatha, reckless of dusty stockings, waded through the heaps of fallen leaves with the delight of a child paddling in the sea; Gertrude picked her steps carefully, and the rest tramped along, chatting subduedly, occasionally making some scientific or philosophical remark in a louder tone, in order that Miss Wilson might overhear and give them due credit.
Soon they were chatting together, with intervals of listening; and not long after, hearing no further sound, they shouldered the tools and set forth again, Merry walking first with Silver's compass to keep them on the right line with Skeleton Island.
Thus chatting pleasantly the band turned back into the woodland and sought their secluded dell, where the trees were the thickest, the moss was the softest, and a secret path led to a cave, at once a retreat and a stronghold.