homeometric autoregulation


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Related to homeometric autoregulation: heterometric autoregulation

autoregulation

 [aw″to-reg″u-la´shun]
control of certain phenomena by factors inherent in a situation; specifically, (1) maintenance by an organ or tissue of a constant blood flow despite changes in arterial pressure, and (2) adjustment of blood flow through an organ in accordance with its metabolic needs.
heterometric autoregulation those intrinsic mechanisms controlling the strength of ventricular contractions that depend on the length of myocardial fibers at the end of diastole.
homeometric autoregulation those intrinsic mechanisms controlling the strength of ventricular contractions that are independent of the length of myocardial fibers at the end of diastole.

ho·me·o·met·ric au·to·reg·u·la·tion

intrinsic regulation of strength of cardiac contraction in response to influences that do not depend on change in fiber length, that is, the Frank-Starling curve, (for example, the Anrep effect in which strength increases in response to increased afterload, and the Bowditch effect (treppe) in which strength increases in response to increased heart rate) and do not depend on extrinsic regulation (for example, in which strength increases in response to sympathetic nerve stimulation or norepinephrine).

ho·me·o·met·ric au·to·reg·u·la·tion

(hō'mē-ō-met'rik aw'tō-reg-yŭ-lā'shŭn)
Intrinsic regulation of strength of cardiac contraction in response to influences that do not depend on change in fiber length, i.e., the Frank-Starling mechanism, (e.g., the Anrep effect in which strength increases in response to increased afterload, and the Bowditch staircase effect [treppe] in which strength increases in response to increased heart rate) and do not depend on extrinsic regulation (e.g., in which strength increases in response to sympathetic nerve stimulation or norepinephrine).

autoregulation

control of certain phenomena by factors inherent in a situation; specifically, (1) maintenance by an organ or tissue of a constant blood flow despite changes in arterial pressure, and (2) adjustment of blood flow through an organ in accordance with its metabolic needs.

heterometric autoregulation
those intrinsic mechanisms controlling the strength of ventricular contractions that depend on the length of myocardial fibers at the end of diastole.
homeometric autoregulation
those intrinsic mechanisms controlling the strength of ventricular contractions that are independent of the length of myocardial fibers at the end of diastole.