autoregulation


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Related to 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.

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

negative-feedback systems that counteract or inhibit change and maintain the status quo

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 ?
For neonates who maintain autoregulation, cardiac output may be a better indicator of cellular oxygen needs because it has been shown to be inversely related to oxygen extraction at the cellular level (Weindling & Kissack, 2001).
Of particular interest for further study are measures of the transfer of the ambulatory blood pressure (ABP) waveform to the ICP waveform, which may reflect cerebral autoregulation.
Bouma GJ, Muizelaar JP: Relationship between cardiac output and cerebral blood flow in patients with intact and with impaired autoregulation.
Therefore, it is important for the practicing neuroscience nurse to have a working knowledge of the role of cerebral autoregulation and available antihypertensive agents.
With the oxidative stress response, activation of the master transcription factor Nrf2 (nuclear factor E2-related factor 2) by reactive oxygen species occurs through multistep signaling and by transcriptional autoregulation, both of which are ultrasensitive in nature (Zhang et al.
The orgasm improvement could be due to the vibration sensation and electrical current at the pelvic area, while the desire improvement may be due to the SNM effect and the restoring activity associated with brainstem autoregulation and attenuation of cingulate activity.
BOSTON, July 24, 2014 /PRNewswire/ -- Vittamed Corporation, a neurodiagnostics medical device company based in Boston with R&D in Lithuania, today announced it has received the CE Mark of approval for two novel neuromonitoring devices: the Vittamed 205 for non-invasive intracranial pressure (ICP) measurement and the Vittamed 505 for non-invasive Cerebrovascular autoregulation monitoring.
Or, cette autoregulation n'existe pas en Algerie[beaucoup plus grand que], estime le journaliste El Kadi Ihcene, createur du site Maghreb emergent.
Other roles of NO include a significant impact on renal blood flow, autoregulation, and the regulation of glomerular filtration.
Or, a partir de 1750, ces principes ont ete ebranles par plu-sieurs facteurs et cette autoregulation est entree en conflit avec d'autres conceptions de l'ordre.

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