In a wide range of organisms, overfill glucose is converted to polymeric forms for storage—glycogen in vertebrates and many microorganisms, starch in plants. In vertebrates, glycogen is found primarily in the liver and also skeletal muscle; it may represent approximately 10% that the load of liver and 1% to 2% of the weight of muscle. If this much glucose were liquified in the cytosol of a hepatocyte, the concentration would be about 0.4 m, sufficient to overcome the osmotic properties of the cell. When stored together a lengthy polymer (glycogen), however, the same mass of glucose has actually a concentration of just 0.01
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The glycogen in muscle is there to carry out a quick resource of energy for either aerobic or anaerobic metabolism. Muscle glycogen have the right to be tired in much less than an hour throughout vigorous activity. Liver glycogen serves together a reservoir the glucose for various other tissues once dietary glucose is not accessible (between meals or throughout a fast); this is especially important for the neurons that the brain, i m sorry cannot usage fatty acids as fuel. Liver glycogen deserve to be depleted in 12 to 24 hours. In humans, the total amount of energy stored as glycogen is much less 보다 the


FIGURE 15-2 Glycogen granules in a hepatocyte. Glycogen is a storage type of carbohydrate in cells, specifically hepatocytes, as illustrated here. Glycogen shows up as electron-dense particles, frequently in aggregates or rosettes. In hepatocytes the glycogen is closely linked with tubules the the smooth endoplasmic reticulum. Countless mitochondria are likewise present.

FIGURE 15-2 Glycogen granules in a hepatocyte. Glycogen is a storage kind of carbohydrate in cells, particularly hepatocytes, as portrayed here. Glycogen shows up as electron-dense particles, regularly in aggregates or rosettes. In hepatocytes the glycogen is closely connected with tubules that the smooth absorbent reticulum. Numerous mitochondria are likewise present.

amount stored together fat (triacylglycerol) (see Table 23-5), but fats cannot be converted to glucose in mammals and cannot it is in catabolized anaerobically.

Glycogen granules are complicated aggregates of glyco-gen and also the enzymes the synthesize it and also degrade it, as well as the machinery because that regulating this enzymes. The general mechanisms for storing and mobilizing glycogen are the same in muscle and also liver, however the enzymes different in ethereal yet vital ways the reflect the different roles the glycogen in the 2 tissues. Glyco-gen is likewise obtained in the diet and broken down in the gut, and also this involves a separate collection of hydrolytic enzymes that convert glycogen (and starch) to cost-free glucose.

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The changes of glucose debated in this chapter and also in chapter 14 are central to the metabolism of most organisms, microbial, animal, or plant. We begin with a conversation of the catabolic pathways from glycogen to glucose 6-phosphate (glycogenolysis) and also from glucose 6-phosphate come pyruvate (glycolysis), then turn to the anabolic pathways native pyruvate come glucose (gluconeogenesis) and from glucose come glyco-gen (glycogenesis).

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