blood flow


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blood flow

quantity of blood flowing through a vessel, region or organ in unit time. Dependent on the arterial blood pressure and the resistance to flow in the local vascular bed, determined by the state of constriction/dilatation mainly of the arterioles, influenced in turn by chemical (local and hormonal) and neural (sympathetic) effects on the vascular smooth muscle.

blood flow

the movement of blood through the vessels. It is pulsatile in the large arteries, diminishing in amplitude as it approaches the capillaries. In the veins it is nonpulsatile. The flow in arteries is the result of ventricular ejection; in the veins it is a result of a number of factors including respiratory movement, muscle compression and the small residuum of arterial pressure.

laminar blood flow
blood flowing through a large blood vessel moves forward in a series of concentric laminae that slide over each other like a telescoping radio aerial. The central lamina moves fastest; the outer layer may be stationary.
turbulent blood flow
created when blood flows through a small caliber orifice. Is the cause of murmurs in the heart and large arteries.
References in periodicals archive ?
C maintained access blood flow measurements between 1,200 and 1,700 mL/minute, which was measured every month as part of vascular access surveillance for a period of four months.
But in a different part of the brain, the link between neuron activity and blood flow disappeared.
2] and/or attenuation of the pressor response, which induced by heat stress decrease ocular blood flow during exhaustive exercise.
During therapeutic exercise, metabolic demand increases and therefore, blood flow is increased to the exercising muscle to meet that demand.
Blood flow in the heart at rest did not differ between smokers and nonsmokers.
Patients post stroke routinely have increased blood flow.
However, the OHT has not been tested to determine its efficacy in the occlusion of arterial blood flow when applied to either arms or legs of human subjects.
Right now, we don't fully understand all the interactions that control skin blood flow during heat stress in healthy young people," says study coauthor Brett Wong, a doctoral student in the Department of Human Physiology at the University of Oregon in Eugene.
Ultimately the increase in skin blood flow will result in the failure to maintain adequate blood flow to the working muscles.
Other possible causes are smoking, which affects blood flow in veins and arteries, and hormonal abnormalities, such as not enough testosterone.
Increased pulmonary blood flow is the physiologic effect of the most common heart defects, such as patent ductus arteriosus (PDA), atrial septal defect (ASD), and ventricular septal defect (VSD).
The authors of this study compared bladder blood flow during filling in 43 patients with and 30 patients without interstitial cystitis, using interval measures from an endoscopic laser Doppler flow probe during hydrodistention under either local or general anesthesia.