Question

4. Answer the following:
(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?​

Answer 1

Answer:

(a) A joint in which the rounded end of one bone fits into the hollow space of other bone is called ball and socket joint. ... All the other bones of skull are immovable. (c) Our elbow cannot move backwards because the elbow has a hinge joint that allows movement in only one direction.

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Answer 2

Answer:

(a) The rounded end of bone fits into the cavity of the other bone. Such a joint allows movements in all directions.

(b) Lower jaw

(c) Elbow cannot move backwards, because it has hinge joint which allows movement in one direction.