Answer:
When an impulse reaches the muscle fibres of a motor unit, it stimulates a reaction in each sarcomere between the actin and myosin filaments. This reaction results in the start of a contraction and the sliding filament theory.
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It is not easily recognizable
Nutrients including sulfur and Phosphorus move through the ecosystem through a biogeochemical cyclic process. Chemical elements move via a pathway, that is termed as a biogeochemical cycle. Those move by means of the biotic and the abiotic components of the ecosystem.
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There is 10 kcal energy left in the 3rd trophic level.
In the nucleus of the cell, there are chromosomes that contain genetic material
