autoregulation

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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.

au·to·reg·u·la·tion

(aw'tō-reg'yū-lā'shŭn),
1. The tendency of the blood flow to an organ or part to remain at or return to the same level despite changes in the pressure in the artery that conveys blood to it.
2. In general, any biologic system equipped with inhibitory feedback systems such that a given change tends to be largely or completely counteracted; for example, baroreceptor reflexes form a basis for autoregulation of the systemic arterial blood pressure.

autoregulation

/au·to·reg·u·la·tion/ (-reg″u-la´shun)
1. the process occurring when some mechanism within a biological system detects and adjusts for changes within the system.
2. in circulatory physiology, the intrinsic tendency of an organ or tissue to maintain constant blood flow despite changes in arterial pressure, or the adjustment of blood flow through an organ in accordance with its metabolic needs.

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

autoregulation

Etymology: Gk, autos, self; L, regula, rule
an intrinsic capacity of organs to regulate their own blood flow or metabolic activity. The former process results from the contraction or relaxation of self-excitable smooth muscle, which causes the constriction or dilation of vessels. It allows organs to maintain constant blood flow and meet their metabolic needs despite variations in systemic arterial pressure.

autoregulation

A general term for a locally controlled feedback process—e.g., the regulation of a gene encoding a transcription factor by its own gene product.

au·to·reg·u·la·tion

(aw'tō-reg-yū-lā'shŭn)
1. The tendency of the blood flow to an organ or part to remain at or return to the same level despite changes in the pressure in the artery which conveys blood to it.
2. In general, any biologic system equipped with inhibitory feedback systems such that a given change tends to be largely or completely counteracted; e.g., baroreceptor reflexes form a basis for autoregulation of the systemic arterial blood pressure.

autoregulation,

n 1. self-adjustment.
2. inherent capability to adjust one's own physiology. See also homeostasis and naturopathy.

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.
References in periodicals archive ?
According to the theory of edema surrounding the surgical bed of excised AVM, arteries supplying cerebral AVMs become dilated and lose their capacity to dilate or constrict to autoregulate pressure.
The difference between the living beings (organisms) and inert structures (mechanisms) is only that in living beings the agency acts from within, with a capacity to autoregulate their inner equilibrium to the degree of their awareness.
This doesn't occur in normal individuals, who autoregulate.
13,39] This might be explained by the fact that the ability to autoregulate is impaired in the severely brain injured, and therefore the close relationship between cerebral blood flow and [CO.
7] Studies have shown poor correlation between blood pressure changes and cerebral perfusion, probably due to patients' varying ability to autoregulate blood flow.
The brain, heart and kidney have a remarkable ability to intrinsically autoregulate their blood flow; the brain has been the organ most studied.
Insulin-like growth factor-I receptor (IGF-IR) translocates to nucleus and autoregulates IGF-IR gene expression in breast cancer cells.

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