contracting		a mineral used by the body and stored by bones
muscular system		muscle that moves food through your body
tendons		muscles that move bones
calcium		the type of muscle that makes up the heart muscle
opaque		an object that does not let light pass through it
shadow		tissues that connect bone to bone
eclipse		when a muscle pulls together and gets shorter
voluntary muscles		muscles that you control
phases		all of the muscles in your body
involuntary muscles		cords of tissue that help muscles move bones
skull		the bones in your head
skeletal muscles		muscles that work without you thinking about them
skeletal system		the moon's changing appearance
smooth muscle		a dark area caused by a blockage of light
cardiac muscle		all the bones in your body
ligaments		when an object passes into the shadow of another object