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प्रश्न
Some people in old age complain of stiff joints. What do you think could be a possible reason for it?
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उत्तर
Some joints like shoulder joint, knee joint need to be held firmly in position to be well-lubricated. Such joints contain a lubricating fluid called synovial fluid, which serves as a cushion between the bones and removes friction during movements. As we age, the joint movement becomes stiffer and less flexible because the amount of lubricating fluid inside the joints decreases and the cartilage becomes thinner. Ligaments also tend to shorten and lose some flexibility, making the joints feel stiff.
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संबंधित प्रश्न
Draw diagrams.
Types of joints
The place where two bones meet is termed as ______.
The finger bones do not have joints.
Irregular bones are seen in ______.
An immovable joint is found in the ______.
Write the type of joint which is used for the following movement:
A person lifts weights to build up his biceps.
Unscramble the jumbled word and write it in the blank space provided.
laxaeriont ................
Ball and socket joints can be seen in ______.
What is the type of movable joint present between the atlas and axis?
Match List I with List II.
| List I | List II |
| A. Fibrous joints | I. Adjacent vertebrae, limited movement |
| B. Cartilaginous joints | II. Humerus and Pectoral girdle, rotational movement |
| C. Hinge joints | III. Skull, don’t allow any movement |
| D. Ball and socket joints | IV. Knee, help in locomotion |
Choose the correct answer from the options given below:
