Skeletal, Cardiac, and Smooth Muscles Answers

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Muscle cells group together to form structures called fasciamuscle fibers✔ myofibrils.

Cardiac muscle works much harder and longer without tiring than other muscles do. It can do that because it has a larger number of ✔ mitochondriafasciclestissues than other muscle cells.

Factors that can cause muscle growth to be slowed include ✔ ageexercisehormones, injury, or diseases.