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The PAT signal is a form of pulse wave amplitude measured by incorporating both a unified pressure field and a specific isosbestic wavelength.Applying a uniform pressure field around the measured surface releases arterial wall motion restriction, magnifies the dynamic range of the recorded signal, and prevents the distention of the veins distal to the site of pressure application.
Vasomotion is the spontaneous oscillation in tone of blood vessel walls, independent of heart beat, innervation or respiration. [1] While vasomotion was first observed by Thomas Wharton Jones in 1852, the complete mechanisms responsible for its generation and its physiological importance remain to be elucidated.
Neurogenic shock is caused by the loss of vascular tone normally supported by the sympathetic nervous system due to injury to the central nervous system especially spinal cord injury. [4] [6] Rupture of a hollow organ, with subsequent evacuation of contents in the peritoneal cavity could also determine neurogenic shock, a subtype of ...
Lesions reflect leakage of plasma components across vascular endothelium and excessive extracellular matrix production by smooth muscle cells, usually secondary to hypertension. [ 11 ] Hyaline arteriolosclerosis is a major morphologic characteristic of benign nephrosclerosis , in which the arteriolar narrowing causes diffuse impairment of renal ...
Vascular resistance occurs when the vessels away from the heart oppose the flow of blood. Resistance is an accumulation of three different factors: blood viscosity, blood vessel length and vessel radius. [ 30 ]
A stop sign is an example of semiotics in everyday life. Drivers understand that the sign means they must stop. Stop signs exist in a larger context of road signs, all with different meanings, designed for traffic safety. A traffic light is another example of everyday semiotics that people use on a daily basis, especially on the road.
Many models of communication include the idea that a sender encodes a message and uses a channel to transmit it to a receiver. Noise may distort the message along the way. The receiver then decodes the message and gives some form of feedback. [1] Models of communication simplify or represent the process of communication.
Tone of voice in spoken communication, conveys meaning. Depending on tone, a phrase can have several meanings; e.g. "you like that" can mean the speaker believes the listener likes something, or it can be a question, or it can convey disbelief. Traffic signs, art, and fashion are all examples of sign systems.