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Often expressed in cm/s. This value is inversely related to the total cross-sectional area of the blood vessel and also differs per cross-section, because in normal condition the blood flow has laminar characteristics. For this reason, the blood flow velocity is the fastest in the middle of the vessel and slowest at the vessel wall.
Vasoconstriction is the constriction of blood vessels (narrowing, becoming smaller in cross-sectional area) by contracting the vascular smooth muscle in the vessel walls. It is regulated by vasoconstrictors (agents that cause vasoconstriction).
When cold, the body attempts to capture heat in the blood by constricting the smooth muscle cells around the microvasculature. The muscle cells are constricted by an increase in calcium. The decreased cross-sectional area for flow increases the vascular resistance and lowers the flow to extremities. This mechanism allows the body to concentrate ...
Velocity Time Integral is a clinical Doppler ultrasound measurement of blood flow, equivalent to the area under the velocity time curve. The product of VTI (cm/stroke) and the cross sectional area of a valve (cm2) yields a stroke volume (cm3/stroke), which can be used to calculate cardiac output.
For those networks, Murray's law predicts constant cross-sectional area, which is observed. [10] The same arguments that imply Murray's law also imply that the distribution of tubules should exhibit a specific power law scaling with size. Plant xylem is known to exhibit that scaling except in scenarios where the passages double as structural ...
A cross sectional area of ≤7 mm² in a symptomatic individual [citation needed] or ≤6 mm² in an asymptomatic individual [13] is considered to be clinically significant and warrants intervention to improve one-year mortality. However, these exact cutoffs are up for debate and different cutoff cross-sectional areas may be used in practice ...
This includes an assessment of their risk factors for heart disease, such as a high blood pressure and/or diabetes. To help us decide whether to start someone on a statin, we will frequently use a ...
Also shows cross-sectional area differences. Aligned to 720 × 496 px grid. Based on , ... Blood vessel; Vasodilation; Vasoconstriction; Usage on ta.wikipedia.org