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STD 11 - 17. Locomotion and movement — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 17. Locomotion and movement4 Marks
MCQ
Select the correct statement with respect to locomotion in humans.
  • A
    The vertebral column has $10$ thoracic vertebrae.
  • B
    The joint between adjacent vertebrae is a fibrous joint.
  • C
    A decreased level of progesterone causes osteoporosis in old people.
  • ✓
    Accumulation of uric acid crystals in joints causes their inflammation.
✓

Answer

Correct option: D.
Accumulation of uric acid crystals in joints causes their inflammation.
d
(d) : Thoracic vertebrae are $12$ in numbers. Joints between adjacent vertebrae are cartilagenous joints and the opposing surfaces are connected by fibrocartilage which allows very little movement. Osteoporosis is a disease characterised by low bone mass and loss of bone tissue that may lead to weak and fragile bones. Osteoporosis occurs when there is an imbalance between new bone formation and old bone resorption. Generalised osteoporosis is common in elderly people and in women following menopause. In osteoporosis, the osteoblastic (bone forming) activity in the bone usually is less than normal and consequently the rate of bone deposition is depressed. Estrogens inhibit osteoclastic (bone resorption) activity in the bones and therefore stimulate bone growth. After menopause, almost no estrogens are secreted by ovaries. This estrogen deficiency leads to increased osteoclastic activity in the bones, decreased bone matrix and decreased deposition of bone calcium and phosphate. In some women, this effect result in osteoporosis.

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