Question

(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 natural or manufactured joint or coupling, such as the hip joint, in which a partially spherical end lies in a socket, allowing multidirectional movement and rotation.

b.The movable joint that is found in the skull is found where the mandible, or the lower jaw, is connected to the skull.

c.Our elbow cannot move backwardsbecause the elbow has a hinge joint that allows movement in only one direction.

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Answer 2

Answer

(A) In ball and socket joint, a ball like structure of the one bone fits into a socket like structure of other bone. It allows movement in all directions. Shoulder and hip joints are the examples of ball and socket joint

(B) The lower jaw bone of the skull is the only movable bone. It allows us to chew food and talk. It is known as mandible.

(C) Our elbow cannot move backwards because elbow has hinge joint and this joint allows movement in one direction only, similar to the hinges of a door. In elbow, it allows to bend and straighten, i.e., up and down movement