Ring structure is defined as the structure in which one or more series of compounds are joined or linked to form a ring. Ring can exist in different sizes such as cyclopropane (small ring: three carbon atoms) and cyclohexane (large ring: six carbon atoms).
In ring structure, there is only carbon atoms linked with hydrogen atoms which are identified by the linkage of two lines.
See the attached figure: cyclopropane (unlabelled atoms are carbon atoms with hydogens).
Thus, in ring structure, an unlabelled atom at an angle where two lines joined assumed to be carbon atom.
The muscular system is an organ system consisting of skeletal, smooth and cardiac muscles. It permits movement of the body, maintains posture and circulates blood throughout the body.