| intrinsic proteins | Proteins that cannot be easily separated from a biomembrane. Synonym: intrinsic proteins. (05 Mar 2000) |
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| intrinsic reflex | A reflex muscular contraction elicited by the application of a stimulus, usually stretching, to the muscle itself as opposed to a muscular contraction caused by an extrinsic stimulus, e.g., skin, as in the abdominal skin reflex's. (05 Mar 2000) |
| intrinsic sphincter | A thickening of the circular fibres of the muscular coat of an organ. (05 Mar 2000) |
| intrinsic sympathomimetic activity | The property of a drug that causes activation of adrenergic receptors so as to produce effects similar to stimulation of the sympathetic nervous system. (05 Mar 2000) |
| tonoplast intrinsic protein | <protein> Plant protein, closely related to major intrinsic protein. Found in plant storage vacuolar membranes. (18 Nov 1997) |