Skeletal muscle contractions do in fact demand large quantities of ATP (adenosine triphosphate), the universal source of cellular energy. In order to accommodate this necessity, skeletal muscle cells (myocytes) are packed with mitochondria, which are the energy powerhouses of the cell.
However, the production of ATP would halt in mitochondria if the necessary substrates (fuels) are not present to enter these organelles, mainly glucose and oxygen (O2). So, additionally, skeletal muscle is also loaded with glycogen, a storage form for glucose (as starch), and myoglobin, an enzyme similar to hemoglobin in that it binds an O2 to hold it for use during contraction.
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The movement of ions across the cell membrane is needed to accomplish repolarization while sodium-potassium pump is used to prepare for depolarization.
The sodium-potassium pump is an active transport system that transports potassium ions into cells and sodium ions out of cells. Using energy from ATP and carrier proteins in the cell membrane, the sodium-potassium pump transports both ions from lower to greater concentration regions. More specific details about the sodium-potassium pump's operation are shown in the Figure. The main ions in both the fluid inside cells and the fluid surrounding them are sodium and potassium, respectively. The resting potential is an electrical gradient that results from these concentration changes across the cell membrane.
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No you can’t because the object has to be at least 0.1 Millimeters long to be visible
DNA stores biological information in sequences of four bases of nucleic acid — adenine (A), thymine (T), cytosine (C) and guanine (G) — which are strung along ribbons of sugar-phosphate molecules in the shape of a double helix. ... Taken as a whole, this package of DNA serves as its owner's complete genetic blueprint. you going to find this in <span>https://www.nlm.nih.gov/visibleproofs/education/dna/dna.pdf
I Don't know about the second one </span>