2. SKELETON
The body is supported within or around by a hard, supportive and protective
framework called skeleton.
The study of bones or the skeleton is called osteology or skeletology
In the vertebrates, the skeletal system is mainly divided into:
1) EXOSKELETON & 2) ENDOSKELETON
EXOSKELETON ENDOSKELETON
The exoskeleton consists of hard parts Bones and cartilages are the hard
present on the surface of the body. supporting parts present inside the body
forming endoskeleton.
It is found both in vertebrates and the
invertebrates Bone and cartilage are specialised
connective tissues.
. E.g. shell in snails and clams.
Bones have a very hard matrix due to
calcium salts in it and cartilages have
slightly pliable matrix due to
chondroitin salts.
dr. aarif
3. FUNCTIONS OF SKELETON
1) It gives definite shape to the body and protects the internal vital
organs like heart, brain, lungs, etc.
2) The bones and cartilages provide surface for the attachment of
muscles.
3) It also acts as a system of levers and helps in movement of body parts
and locomotion.
4) Red bone marrow present at the ends of long bones and spongy bones
helps in production of RBC's and other blood cells.
5) Bones act as store house of Ca, P, Mg, etc
dr. aarif
