Answer the following CBSE Class 6 Science NCERT
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CBSE-Class-6-Science-NCERT-->View question

Answer the following: CBSE-Class 6 Science NCERT

(a)What is a ball and socket joint?
(b)Which of the skull bones are movable?
(c)Why can our elbow not move backwards?
From Chapter-8 "BODY MOVEMENTS"


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Ball and socket joint: Ball-and-socket joint, also called spheroidal joint, in vertebrate anatomy, a joint in which the rounded surface of a bone moves within a depression on another bone, allowing greater freedom of movement than any other kind of joint. It is most highly developed in the large shoulder and hip joints of mammals, including humans, in which it provides swing for the arms and legs in various directions and also spin of those limbs upon the more stationary bones.

Which of the skull bones are movable:
Lower jaw bone or mandible is the only movable bone in the skull.
Why can our elbow not move backwards:
Our elbow cannot move backwards because the elbow has a hinge joint that allows movement in only one direction.



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