Support System by Maria

The Skeletal System And The Muscular System

Skeletal System

Your body has a skeletal system that is made of bones. The Skeleton of a grown-up person has about 200 bones. the spine is the part of the skeleton that extends down the center of the back. It forms a strong framework that supports the body. The largest bone is the hip bone or pelvis. In fact it is made of six bones joined firmly together. The longest bone is the femur it is located in the thigh. It makes up almost one quarter of the body's total height. The smallest bone is the stirroup deep in the ear. It is hardly larger than a grain of rice. The ears and the nose do not have bones inside them. Your nose and ears are made up of cartilage. Cartilage is a strong, flexible material that forms parts of the body. Cartilage is not as stiff or hard as bone.

Muscular System

The muscular system moves the body. The body has more than 600 muscles. There are three kinds of muscles.There's a Skeletal muscle, a Smooth muscle and a Heart muscle.

Your heart has a special job.It beats 24 hours a day.Your Skeletal muscles move bones.

Smooth muscles move blood through the blood vessels.Your Skeletal muscles move the legs,the arms,and the feet.They move when you want them to move.This is why they are sometimes called voluntary muscles.Some muscles do not move bones.Some parts of the body are moving all the time!