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The Muscular system is the organ system whose primary function is movement and flexibility. The muscular system is made up of the muscles that let you move. There are three kinds of muscle in your body. Smooth muscle moves food through the digestive system.Cardiac muscle pumps blood throughout the body.he Muscular system is the organ system whose primary function is movement and flexibility. The muscular system is made up of the muscles that let you move. There are three kinds of muscle in your body. Smooth muscle moves food through the digestive system.
The bodies of organisms are organized into functional systemsâcells are organized into tissues, and tissues are organized into organs. Body systems carry out critical functions, such as locomotion, reproduction, digestion, and circulation. Cells are arranged in hierarchical levels of organization. 2  The lowest form of organization is the cell followed by tissues, organs, and organ systems. 3  A tissue is a group of similar cells in an organism working together to perform a particular function (e.g. nerve or muscle tissue).