Match the following. Match the items in the left column to the items in the right column.
1. exercise
2. lactic acid
3. muscle fibers
activities that improve the health of
the heart, lungs, muscles, and joints of a
person
a by-product produced in the
muscles during exercise
the cells that make up a muscle
small sections in a muscle cell that
move when a muscle is being used
how far in any direction a part of
the body is able to move
4. muscle myofibrils
5. range of motion
