Which of the following accurately pairs the type of receptor to the stimuli in which it responds? A. Chemoreceptor–pressure B. Photoreceptor–chemicals C. Pain receptor–tissue injury D. Mechanoreceptor–temperature

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C. Pain receptor–tissue injury  Neuroreceptors are found all over one's body and epithelial tissues to detect and be aware of the external stimuli Receptor proteins are molecules inside a cell or on its surface on which ligands bind. A ligand is any substance (e.g. a hormone, drug, functional group) that binds specifically and reversibly to another chemical entity to form a large complex. Receptor proteins found inside a cell are called internal receptors or intracellular receptors or cytoplasmic receptors. 

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