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Because the energetic demands could be high, especially in red fibers with a lot of mitochondria and haemoglobin. They need to convert glicose to ATP to shorten and in muscle contraction and lengthen as well.

Good morning, the TEG contains TRIS to keep pH of solution constant, EDTA to capture ions Ca2+ and Mg2+ in solution (which may interfere in the isolation of DNA) and Glicose/Dextrose (+- 50 mM) is used to increase the osmolarity of solution and lysin the cell. the cell swells to bursting and the DNA remains in solution.

Our bodies don't actually store starches such as those found in vegetation but we do store fats in adipose (fatty tissue) cells. The cells can expand indefinitely to contain more and more fat and are found throughout the body- most predominantly under the dermis, and around some major organs i.e. the heart, liver etc.