Biology presentation for the skeleton Essay

This essay has a total of 664 words and 5 pages.

biology presentation for the skeleton

Intro - slide 1 - acetate 1

The skeleton of a human foetus is formed from tough but flexible cartilage that acts as a
blueprint for bone construction. During ossification ( the changing of cartilage to bone)
which begins before birth, the cartilage is broken down and the resulting space is filled
by bone building mineral salts and protein fibres secreted by bone cells.

Humans have a bony endoskeleton made up of 206 bones, although we are born with up to 300,
but many of these fuse during childhood. slide 2 The skeleton is divided into two parts ;
the axial and the appendiculur.

Axial skeleton

The axial skeleton consists of the skull, backbone and rib cage which forms the upright
axis of the body. It helps to protect the brain, spinal cord and organs in the chest.

Appendicular skeleton

The appendicular skeleton consists of the upper and lower limbs and the pectoral
(shoulder) and pelvis and girdles. The human pelvis is adapted for an upright stance. the
lower limbs support the upper body and enable walking and other locomotory movements to
take place, where as the upper limbs are used for manipulation.

Slide three

Just read off screen

Slide four - acetate 2

Muscles are used to move your bones. Most muscles are joined at both ends to bones. They
are joined to bones by non elastic tendons. Bones are held in place by strong fibres
called ligaments.

Slide five - acetate 3
Joints are formed when two or more bones come together. Most joints allow bones to move.
The amount of movement depends on the type of joint. The elbow joint is a hinge joint.
Joints that allow movement are called synovial joints. A synovial joint s adapted to
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