Which two structures make up the muscular system?

Three types of muscles make up the muscular system. It is called skeletal, cardiac, and smooth muscles. Skeletal muscles are connected to the skeletal system. We can control the muscles found in skeletal. Cardiac muscles are muscles found in the heart. It is involuntary which means we can't control them. Smooth muscles are found inside the organs. 

Ribonuclease activity is a type of nuclease that catalyzes the degradation of rna into small components.