question_answer

Answer the following :

(a) What is ball and socket joint?

(b) Which of the skull bones are movable?

(c) Why can our elbow not move backwards?

Answer:

(a) A ball and socket joint is the joint in which the rounded end of one bone fits into the cavity (hollow space) of the another bone. Such a joint allows movements in all directions.

(b) Lower jaw of the skull is movable.

(c) Elbow has hinge joint due to which our elbow cannot move backwards.