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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
What is a Joint?
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?
(d) Name the parts 1 to 5. 2
There are ______ types of movable joints.
______ is an immovable joint.
Name two joints with examples.
Provide one word answers to the statement given below.
Joint where our neck joins the head.
Write the type of joint which is used for the following movement:
A cricket bowler bowls the ball.
Write the type of joint which is used for the following movement:
A person lifts weights to build up his biceps.
Match List - I with List - II.
| List - I | List - II | ||
| (a) | Scapula | (i) | Cartilaginous joints |
| (b) | Cranium | (ii) | Flat bone |
| (c) | Sternum | (iii) | Fibrous joints |
| (d) | Vertebral column | (iv) | Triangular flat bone |
Choose the correct answer from the options given below.
Match List I with List II:
| List I (Type of Joint) | List II (Found between) |
| A. Cartilaginous Joint | I. Between flat skull bones |
| B. Ball and Socket Joint | II. Between adjacent vertebrae in vertebral column |
| C. Fibrous Joint | III. Between carpal and metacarpal of thumb |
| D. Saddle Joint | IV. Between Humerus and Pectoral girdle |
Choose the correct answer from the options given below:
