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Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its physiological effects).
Typically the fingers, and, less commonly, the toes, are involved. [1] Rarely, the nose, ears, nipples, or lips are affected. [1] The episodes classically result in the affected part turning white and then blue. [2] Often, numbness or pain occurs. [2] As blood flow returns, the area turns red and burns. [2]
HAVS, also known as vibration white finger (VWF) or dead finger, [1] is a secondary form of Raynaud's syndrome, an industrial injury triggered by continuous use of vibrating hand-held machinery. Use of the term vibration white finger has generally been superseded in professional usage by broader concept of HAVS, although it is still used by the ...
A laceration of the nail bed causes bleeding into the constricted area underneath the hard nail plate. [1] The blood pools under the nail, giving a reddish, brownish, blueish, or grey/blackish discoloration. The blood puts pressure to the nailbed causing pain which can be throbbing in quality and disappears when the pressure on the nail bed is ...
Abrasions usually involve minimal bleeding. [2] Mild abrasions, also known as grazes or scrapes , do not scar or bleed because the dermis is left intact, but deep abrasions that disrupt the normal dermal structures may lead to the formation of scar tissue.
Keep your room cool and free of sound and light distractions If you can’t fall asleep after 20 minutes, get up and do a relaxing activity until you feel tired again If none of those help ...
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Hemoglobin oxygenation dissociation curve. In the case of methemoglobinemia the curve is shifted to the left given the higher affinity for oxygen. [22] Methemoglobinemia can be acquired or congenital. It occurs when the iron in hemoglobin is oxidized from Fe 2+ to Fe 3+, leading to poor binding of oxygen. Additionally, the oxygen that is ...