Answer :

BlueSky06
Muscle is the part of the body that is attached to the bones and are responsible mostly for body's locomotion. There are three types of which: (1) skeletal, (2) cardiac, (3) smooth. 

This part of the body is compact and thus has a greater density because it occupies larger mass for a given volume. 

                         density = mass / volume

Because it has great density then, the mass is also large. Thus, this accounts for a large portion of the body mass. 

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