A United States Navy enlisted rank indicates where an enlisted Sailor stands within the chain of command, and also defines one's pay grade. An enlisted sailor's rate is similar conceptually to a naval officer's rank. Only Naval Officers carry the term rank in the Navy.
Muscular system is the system of Human Body that provides motor power for all movements of body parts. Muscular system is composed of special tissue called muscular tissue. Muscles have the ability to contract actvely to provide the force for movements of body parts.
Muscular system has the following important functions in human body; 1  MOVEMENTS OF BODY PARTS: Skeletal muscles are responsible for all voluntary movements of human body parts. 2  They provide the force by contracting actively at the expense of energy.