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 ?
Table 21: US Recent Past, Current & Future Analysis for Blood Flow Measurement Devices by Site of Care - Operating Units, Intensive Care Unit, Emergency Units, Vascular Laboratory, Dialysis Units and Other Markets Independently analyzed with Annual Sales Figures in US$ million for Years 2000 through 2010 (includes corresponding Graph/Chart) III-10
But by finding a case when neurons are busy with no corresponding change in blood movement, the new study shows that blood flow isn't always a reliable marker of neural activity.
Ultrasonography determined post-workout tests on volumetric blood flow and blood vessel dilation in the brachial artery of the arm showed significantly elevated blood flow, along with statistically significant elevations in brachial (arm) dilation in as little as one week.
It has been demonstrated that submaximal exercise increases the choroidal blood flow velocity relative to the increase in mean arterial pressure (MAP) (Hayashi et al.
Researchers used PET to measure myocardial blood flow, or blood flow in the heart, both at rest and during stimulation induced by a cold pressor test, which involves subjecting an individual to a cold stimulus.
Imaging showed the control patient had increased blood flow in every area of the brain, but after hyperbaric oxygen treatment, all areas were normally perfused, Dr.
As with shiatsu, pressure is key, but here the therapist uses the thumb, fingers, and elbow on two points only (shiatsu uses the whole meridian line), temporarily reducing blood flow to the area.
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.