电阻应变片由敏感栅、基底、覆盖层和引线等部分组成

敏感栅直径为0.01~0.05mm、高电阻系数的细丝弯曲而成栅状,实际上是一个电阻元件

敏感栅通过粘接剂牢固粘贴在绝缘基底上,两端通过引线引出

电阻应变片只能是金属材质

正确

错误

社区常见健康问题为主

慢性疾病为主

疑难杂症为主

急症重症为主

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desc

view

look

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②③

①②

①③

铬8%

镍18%

铬18%

镍18.8%

铬18.8%

Fasting cells can mobilize glucose that has been stored in the form of glycogen, a branched polymer of glucose . This large polysaccharide is stored as small granules in the cytoplasm of many animal cells, but mainly in liver and muscle cells . The synthesis and degradation of glycogen occur by separate metabolic pathways, which can be rapidly and coordinately regulated to suit an organism’s needs.

When more ATP is needed than can be generated from food-derived molecules available in the bloodstream, cells break down glycogen in a reaction that is catalyzed by the enzyme glycogen phosphorylase. This enzyme produces glucose 1-phosphate, which is then converted to the glucose 6-phosphate that feeds into the glycolytic pathway.

Like glycolysis and gluconeogenesis, the glycogen degradative and synthetic pathways are coordinated by feedback regulation. In this case, enzymes in each pathway are allosterically regulated by glucose 6-phosphate, but in opposite directions: in the synthetic pathway, glycogen synthetase is activated by glucose 6-phosphate, whereas glycogen phosphorylase, which breaks down glycogen, is inhibited by glucose 6-phosphate, as well as by ATP.

This regulation helps to prevent glycogen breakdown when ATP is plentiful and to favor glycogen synthesis when the glucose 6-phosphate concentration is high. The balance between glycogen synthesis and breakdown is further regulated by intracellular signaling pathways that are controlled by the hormones insulin, epinephrine, and glucagon.

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