"Describe the effect of increasing stimulus voltage on isolated skeletal muscle. Specifically, what happened to the muscle force generated with stronger electrical stimulations and why did this change occur

When stimulus voltage is increased on isolated skeletal muscle, the amount of active force produced by the muscle also increases. It increases to the point in which it reaches a plateau and was no longer able to increase. This change is due to the fact that more fibers and more motorneurons are activated and that leads to an increase in muscle force.

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the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.