Chapter 4: Body Movements

Q&A -Ask Doubts and Get Answers

Q
Body Movements

Question:

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:

(a) In the ball and socket joint, one end of the bone has a round shape like a ball which fits into a hollow space (socket or cavity) in the other bone. It allows movement in all directions. Example: Shoulder joints and hip joints.

(b) Fixed joint is present between the skull and upper jaw. Only the lower jaw is a movable bone in a skull.

(c) Hine joint allows the movement of bones in only one direction. The elbow joint is an example of a hinge joint that is why we cannot move our elbow backward. 


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