A receptor is a molecular target for a chemical signal such as a neurotransmitter, hormone, or drug. Binding of the signal to the receptor initiates or modulates behaviour in the receiving cell.

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Does suffocation pain involve nociceptors?

I never suffocated myself so not entirely sure, but when you suffocate, it's painful, right? But of course different kind of pain than being injured or sick. What I'm wondering is, if the "painful" ...
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Are all Autoreceptors Downregulated by their Respective Endogenous Ligands?

I know that the 5-HT1A and $\alpha$2 adrenoreceptors receptors serve as autoreceptors for serotonin (5-HT) and norepinephrine respectively and are down-regulated by repeat exposure to their respective ...
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Why is there only adrenoreceptors and no active adrenergic innervation in bronchus and uterus?

Our bronchus and uterus has beta adrenoreceptors, but they have no active sympathetic nervous system innervation in these organs. Was there a sympathetic innervation in trachea and uterus, earlier, ...
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If a receptor is inhibited throughout embryogenesis, could there be observable phenotypic differences in the adult?

So I read a journal article entitled "Maternal hypoxia and caffeine exposure depress fetal CV function during primary organogenesis" (Momoi, et al., 2012) and in essence the article speaks of the ...
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Which classes of drugs (filed by their pharmacology) induce a release of β-endorphin?

Which classes of drugs (filed by their binding sites) induce a release of β-endorphin? I know of agonists of the nAChRs and 5-HT1A and ethanol. Are there any others? Please cite journal articles ...
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Does regulate always mean suppress when it comes to heteroreceptors?

Do heteroreceptors always suppress the release of the neurotransmitter they regulate upon their (the heteroreceptor's) activation?