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Answer:</h2>
<u>A. The concentration of calcium in the myofibril must decrease.
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Explanation:</h2>
Each time we move a muscle, it requires the joined activity of trillions of myosin engines. Our muscle cells use calcium particles to facilitate this monstrous atomic exertion. At the point when a muscle cell is given the sign to contract from its related nerves, it discharges a surge of calcium particles from an uncommon intracellular holder, the sarcoplasmic reticulum that encompasses the groups of actin and myosin fibers.
The calcium particles quickly spread and tie to Tropomyosin on the actin fibers. They move shape somewhat and enable myosin to tie and start moving up the fiber. These trillions of myosin engines will keep climbing, getting the muscle, until the calcium is evacuated.
The calcium pump enables muscles to relax after this furious flood of calcium-instigated constriction. The siphon is found in the film of the sarcoplasmic reticulum.
Answer:
B. Sunlight
F. Water
Explanation:
Abiotic factors are nonliving components.
Saudi Arabia has a desert climate characterized by extreme heat<span> during the day, an abrupt </span>drop in temperature at night, and very low annual rainfall. Iraq has a hot, dry climate <span>The </span>climate<span> is influenced by </span>Iraq's<span> location between the subtropical aridity of the Arabian desert areas and the subtropical humidity of the Persian Gulf</span>. Iran has a hot, dry climate characterized by long, hot, dry summers and short, cool winters. The climate is influenced by Iran's location between the subtropical aridity of the Arabian desert areas and the subtropical humidity of the eastern Mediterranean characterized by long, hot, dry summers and short, cool winters.
14C (carbon-14) can be used to date a 20,000 year old skeleton
The cell continues to divide