Grade 4 | Science | Skeletal system, Human Body and Health, Olympiad, CBSE, ICSE, SOF, ITO
The system of bones and joints is known and skeletal system. It gives shape and support to our body.
Human infants have more than 300 bones initially. Over the time many of these bones merge and fuse together. By the age of nine most humans have 206 bones. Thus an adult human has 206 bones.
Main functions of the skeletal system are :
It gives shape and support to our body.
The skeletal system along with muscular system helps in movement.
It protects many vital organs of our body. E.g. Ribs protect our heart and lungs. Cranium protects our brain.
Red blood cells, most white blood cells, and platelets are produced in the bone marrow, the soft fatty tissue inside bone cavities.
The largest bone in human body is femur or thighbone.
Ear has the smallest bone.
Vertebra is part of the skeletal system.
The vertebral column is made of many small bones.
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