The term is used chiefly for such a hardening of the nervous system due to hyperplasia of the connective tissue or for hardening of the blood vessels. Non-acclimatized individuals can survive −5 °C, while an acclimatized individual in the same species can survive −30°C. Just as water vapor in the atmosphere can condense to form liquid water, a solid dissolved in a liquid can condense to form a solid. On the other hand, work conditioning refers to a goal-oriented and intensive program designed to restore musculoskeletal and neuromuscular function. See more. n. 1. This causes for the smooth muscle to become exposed where platelets present within the blood form a fibrous “cap” structure over the plaque deposition, sealing it into the arterial wall, further solidifying the plaque. Cold hardening is a process in which a plant undergoes physiological changes to avoid, or mitigate cellular injuries caused by sub-zero temperatures. The penis contains two chambers called the corpora cavernosa, which run the length of the organ, are filled with spongy tissue, and are surrounded by a membrane called the tunica albuginea.The spongy tissue contains smooth … How Do I Use Study.com's Assign Lesson Feature? - Definition, Angle & Coefficient, What is Specific Volume? just create an account. For example, aluminum can dissolve some copper at high temperatures. Signup as a free member below and you'll be brought back to this page to try the sample materials before you buy. 2045–51. Fatty streaks are the first line of warning of atherosclerosis which is able to be visualized without magnification. It describes the build-up of plaques also known as fatty deposits in the inside of arteries that cause the disorder to be progressive as it can either block the artery or increase the chance of an artery being blocked. Here's a more detailed overview of the precipitation-hardening process: Get access risk-free for 30 days, Endothelial damage to the arterial wall causes chemicals from the blood such as cholesterol to become collected under the damaged endothelium lining forming fatty streaks (Figure 1). These fats become oxidised which sends a signal to the immune system. This causes the development of the atheroma behind the endothelium, narrowing the lumen of the arteriole vessel. (är-tîr′ē-ō-sklə-rō′sĭs) A thickening and hardening of the walls of the arteries that interferes with the circulation of the blood. ... called arteriosclerosis, or hardening … precipitation definition: 1. water that falls from the clouds towards the ground, especially as rain or snow: 2. a way of…. credit by exam that is accepted by over 1,500 colleges and universities. “Compensatory enlargement of human atherosclerotic coronary arteries”. This high blood pressure increases the chance of an individual to acquire further atherosclerosis as there is a higher chance that a plaque will form again due to the high blood pressure. This lesson defines precipitation in solid materials and explains how precipitation hardening increases the hardness of materials by impeding dislocation motion. Precipitation definition is - the quality or state of being precipitate : hastiness. Therefore, the aging temperature and aging time must be tuned to optimize the precipitate size in order to maximize the ability of the precipitates to impede dislocation motion and therefore maximize a material's hardness. These impurity regions, or precipitates, strengthen materials by impeding the movement of dislocations. In short: we provide absolutely everything you need to pass A-Level Biology: https://en.wikipedia.org/wiki/Atheroma#cite_note-pmid3574413-5, https://en.wikipedia.org/wiki/Atherosclerosis, https://www.sciencesource.com/archive/Plaque-in-Artery-SS2569686.html, Atherosclerosis is a progressive disorder and primarily an inflammatory disease, It is caused by atheroma’s and marked by the narrowing of arteries by the hardening done by plaques, Atheroma is the flaky material made up of lipids (cholesterol and lipid), macrophages, calcified lesions and fibrous tissue that are present nearest the lumen of an artery, Atherosclerosis begins with damage to the endothelium wall of the arterial wall, Damage to the endothelial wall causes an inflammatory response where there is recruitment of white blood cells. More generally, precipitates are small impurity regions that form in a material when it is no longer able to dissolve the impurity. How to use precipitation in a sentence. … and career path that can help you find the school that's right for you. Basically, this process involves heating a mixture to a high temperature, then cooling, then heating to a medium temperature, and finally cooling again. The numerous sudden changes that evoke rapid and short-term responses imaginable degree, area of If you somehow make it more difficult for these dislocations to move, you also make it more difficult to deform the paperclip and therefore make the paperclip harder. Healthy arteries are flexible and elastic, but over time, the walls in your arteries can harden, a condition commonly called hardening of the arteries.Atherosclerosis is a specific type of arteriosclerosis… To unlock this lesson you must be a Study.com Member. 9, pp. Macrophages are another important white blood cell of the immune system that are present in response to an infection or the accumulation of damaged/dead cells. If the plaques begin to get bigger they are able to narrow the blood vessel and obstruct blood flow, which can cause further complications; if a blockade occurs in the brain a stroke can strike or tissue/cells can die due to inadequate supply of oxygen (ischemia). 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