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Question
Some people in old age complain of stiff joints. What do you think could be a possible reason for it?
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Solution
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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Alongside is shown a diagrammatic skeletal of synovial j oint.
(a) What is a synovial joint?
(b) Where do you find such a joint?
(c) What is the function of cartilages?
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Unscramble the jumbled word and write it in the blank space provided.
laxaeriont ................
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| List - I | List - II | ||
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| (b) | Cranium | (ii) | Flat bone |
| (c) | Sternum | (iii) | Fibrous joints |
| (d) | Vertebral column | (iv) | Triangular flat bone |
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Match the following and mark the correct option
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| A. Sternum | i. Synovial fluid |
| B. Glenoid Cavity | ii. Vertebrae |
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Name the type of joint between the following:
Atlas/axis
