Explain the events of the sliding filament theory of skeletal muscle contraction beginning with immediately after the release of ca from the sarcoplasmic reticulum and ending at the end of one cross bridge cycle. describe how asynchronous multiple cross bridge cycles affect the sarcomere. what are the roles of atp in muscle contraction?

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

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