Muscle is a ____ tissue found in most animals. Muscle cells contain protein ____ of actin and myosin that slide past one another, producing a contraction that ____ both the length and the shape of the cell. Muscles function to produce force and ____. They are primarily responsible for maintaining and changing ____, locomotion, as well as movement of ____ organs, such as the contraction of the ____ and the movement of ____ through the digestive system via peristalsis. Muscle tissues are derived from the mesodermal layer of embryonic germ cells in a process known as ____. There are three types of muscle, ____ or striated, cardiac, and ____. Muscle action can be classified as being either ____ or involuntary. Cardiac and smooth muscles contract ____ conscious thought and are termed ____, whereas the skeletal muscles contract upon ____. Skeletal muscles in turn can be divided into fast and slow twitch fibers. The term muscle is ____ from the Latin musculus meaning "little mouse" perhaps because of the ____ of certain muscles or because ____ muscles look like mice moving ____ the skin.

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