Q.2 Define human skeleton. Describe its types and role.
Answer:
Skeleton
Skeletal system or skeleton is defined as the framework of hard articulated structures that provide physical support, attachment for skeletal muscles and protection for bodies of animals.
Types of skeleton
It is of two types:
(i) Endoskeleton:
The skeleton which is present on inside the body is called endoskeleton. e.g. in. Vertebrates and Human.
(ii) Exoskeleton:
The skeleton which is present outside of the body e.g. in arthropods. Parts of Skeleton: There are two
parts of skeleton:
1) Cartilage
2) Bones
In the living body, skeleton is very much alive. Bones and cartilage are made up of living cells having nerves and blood vessels in them. They grow and have the ability to repair themselves.
Role of Skeleton system: Skeletal system provides:
1) Movements
2) Protection
3) Support
1-Movements: Skeleton works very closely with the muscular system to help the body for movement.
2-Protection: Skeleton provides protection to many of our internal organs e.g. skull protects brain, vertebral column protects spinal cord and ribs protect many organs especially heart and lungs
3- Support: Skeleton provides support to our body mass e.g. vertebral column provides main support to our body mass.
