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There are more than 600 muscles in the human body . Muscles have a variety of functions , such as pumping blood , supporting movement or ____________________ birth . Muscles work by either contracting or ____________________ to cause movement . This movement may be voluntary ( meaning the movement is made ____________________ ) or ____________________ ( i . e . done without our conscious awareness ) .
The three main types of muscle tissue include :
? Skeletal muscle is ____________________ to bones and allows movement . Together , skeletal muscles and bones are called the musculoskeletal system ( also known as the locomotor ____________________ ) . Skeletal muscles are grouped into opposing pairs such as the biceps and ____________________ on the ____________________ and back of the upper arm . Skeletal muscles are under our ____________________ control , which is why they are called voluntary muscles . Another term is ____________________ muscles , since the tissue looks striped when viewed under a microscope .
? Cardiac muscles are located in your heart only . They help your heart ____________________ blood throughout your body . They are involuntary muscles that your ____________________ nervous system controls . That means they work without you having to ____________________ about it .
? Smooth muscle ____________________ up your organs , blood ____________________ , ____________________ tract , skin and other areas . Smooth muscles are involuntary . That means that your autonomic nervous system controls them or , in other words , the motion of smooth muscle happens without our conscious ____________________ .
The ____________________ of the muscles in your body are skeletal muscles . They are the muscles that allow you to ____________________ a wide range of movements and functions . ____________________ ( tough bands of connective tissue ) attach skeletal muscle tissue to ____________________ throughout your body . Your shoulder muscles , ____________________ muscles and abdominal muscles are all examples of skeletal muscles .