Q. No.Select the correct statement regarding the specific disorder of muscular or skeletal system.
1.
Myasthenia gravis - Autoimmune disorder which inhibits sliding of myosin filaments.
2.
Gout - Inflammation of joints due to extra deposition of calcium.
3.
Muscular dystrophy - Age related shortening of muscles.
4.
Osteoporosis - Decrease in bone mass and higher chances of fractures with advancing age.
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Which one of the following pairs of chemical substances are correctly categorized?
|
Enzymes |
Characteristics |
|
|
1 |
Troponin and myosin |
Complex protein in striated muscles |
|
2 |
Secretin and rhodopsin |
Polypeptide hormones |
|
3 |
Calcitonin and thymosin |
Thyroid hormones |
|
4 |
Pepsin and prolactin |
Two digestive enzymes secreted in stomach |
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Select the correct statement with respect to locomotion in humans:
1. A decreased level of progesterone causes osteoporosis in old people
2. Accumulation of uric acid crystals in joints causes their inflammation
3. The vertebral column has 10 thoracic vertebrae
4. The joint between adjacent vertebrae is a fibrous joint
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Select the correct matching of the characteristics and an example of a synovial joint in humans:
|
Characteristics |
Examples |
|
|
1. |
Fluid cartilage between two bones, limited movements |
Knee joint |
|
2. |
Fluid filled between two joints, provide cushion |
Skull bones |
|
3. |
Fluid filled synovial cavity between two bones |
Joint between atlas and axis |
|
4. |
Lymph filled between two bones, limited movement |
Gliding joint between carpals |
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Glenoid cavity articulate
1. Clavicle with acromion
2. Scapula with acromion
3. Clavicle with scapula
4. Humerus with scapula
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Which one of the following joints would allow no movement?
1. Ball and socket joint
2. Fibrous joint
3. Cartilaginous joint
4. Synovial joint
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It is much easier for a small animal to run uphill than for a large animal, because
1. It is easier to carry a small body weight
2. Smaller animals have a higher metabolic rate
3. Small animals have a lower O2 requirement
4. The efficiency of muscles in large animals is less than in the small animals
Osteoporosis, an age related disease of skeletal system, may occur due to
1. High concentration of Ca++ and Na+
2. Decrease level of estrogen
3. Accumulation of uric acid leading to inflammation of joints
4. Immune disorder affecting neuromuscular junction leading to fatigue
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Out of ‘X’ pairs of ribs in humans, only ‘Y’ pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation.
1. X = 12, Y = 15 True ribs are attached dorsally to vertebral column and sternum on the two ends
2. X = 24, Y = 7 True ribs are dorsally attached to vertebral column but are free on ventral side
3. X = 24, Y = 12 True ribs are dorsally attached to vertebral column but are free on ventral side
4. X = 12, Y = 7 True ribs are attached dorsally to vertebral column and ventrally to the sternum
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Calcium is important in skeletal muscle contraction because it
| 1. | Detaches the myosin head from the actin filament |
| 2. | Activates the myosin ATPase by binding on it |
| 3. | Binds to troponin to remove the masking of active sites on actin for myosin |
| 4. | Prevents the formation of bonds between the myosin cross bridges and the actin filament |
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