(i) What are movable joints? Explain any one joint with neat diagram. (ii) What is cartilage? How does it help the bones?
Answers
2Hyaline, or articular, cartilage covers the ends of bones to create a low-friction environment and cushion at the joi/nt surface. When cartilage in the jo/int is healthy, it effectively allows fluid bending/straightening motions and protects the jo/int against weight-bearing stresses.
Answer:
(1). = movable joints are also known as synovial joints . this is because the space between the bones is filled with A thick fluid ,called synovial fluid that cushions the joint A movable or synovial joint is protected and cushioned by cartilage and synovial fluid.
1= Ball and socket joint : in this joint the ball shaped head of a bone is fitted in the socket made by another bone in such a manner that it allows free movement in all the direction .
example the joint between the head of the humerus and the glenoid cavity of the pectoral girdle .
(2)= cartilage is the main type of connective tissue seen throughout the body it serves a variety of structural and functional purpose and exists in different types throughout our joints bones, spine , lungs ear and nose.
cartilage performs important functions inside the Complex structure of our joints firstly it ensures that the bones move smoothly in the joint and secondly it can cushion ans deaden loads the impacts up to seven Times our body weight,thus preventing bone damage.