The ability of a muscle to contract and relax is dependent on the flow of what substance out of and into its storage site in the muscle cell?

The correct answer will be- Calcium

Explanation:

Muscle contraction and relaxation are dependent on the presence or absence of an element which controls the movement of troponin and tropomyosin in the muscles that are calcium.

Calcium help forms the cross-bridge as the troponin gets activated in the presence of calcium which causes conformational changes in the troponin which allows the movement of the tropomyosin from the myosin-binding sites. The movement of troponin-tropomyosin helps the formation of cross-bridge which allows muscle contraction and relaxation.

Thus, calcium is the correct answer.

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answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg