Question

what changes are observed in muscles while working? ​

Answer 1

Answer:

Although muscle cells can change in size, new cells are not formed when muscles grow. Instead, structural proteins are added to muscle fibers in a process called hypertrophy, so cell diameter increases. The reverse, when structural proteins are lost and muscle mass decreases, is called atrophy.

Answer 2

Answer:

while working ,contraction and relaxation of muscles can be seen.while lifting heavy weights etc a bump can be seen on the upper hand .this proves that contraction and relaxation of muscles take place

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