4. BONES MUSCLES
BONES ARE HARD
AND RIGID.
MUSCLES ARE
SOFT AND
ELASTIC.
KIDS HAVE GOT
OVER 300
BONES.
ADULTS HAVE
GOT 206
BONES.
KIDS AND ADULTS HAVE
GOT 650 MUSCLES.
BONES
JOIN AS
WE
GROW UP
THE FEMUR IS THE LONGEST, THE HEAVIEST AND
THE STRONGEST BONE IN THE HUMAN BODY.
THE STIRRUP IS THE SMALLEST BONE IN THE
HUMAN BODY. IT’S IN THE EAR.
MUSCLES CAN CONTRACT AND
RELAX.