During muscular contraction, which of the following events occur?
(a) | 'H' zone disappears |
(b) | 'A' band widens |
(c) | 'I' band reduces in width |
(d) | Myosin hydrolyzes ATP, releasing the ADP and Pi |
(e) | Z-lines attached to actins are pulled inwards |
Choose the correct answer from the options given below:
1. (b), (c), (d), (e) only
2. (b), (d), (e), (a) only
3. (a), (c), (d), (e) only
4. (a), (b), (c), (d) only
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:
(a) | (b) | (c) | (d) | |
1. | (iv) | (ii) | (iii) | (i) |
2. | (iv) | (iii) | (ii) | (i) |
3. | (i) | (iii) | (ii) | (iv) |
4. | (ii) | (iii) | (iv) | (i) |
Chronic auto immune disorder affecting neuro muscular junction leading to fatigue, weakening and paralysis of skeletal muscle is called as:
1. | Myasthenia gravis | 2. | Gout |
3. | Arthritis | 4. | Muscular dystrophy |
The name of the joint between the ribs and sternum is:
1. Cartilaginous joint
2. Angular joint
3. Gliding joint
4. Fibrous joint
Unit of contraction in a muscle fiber is:
1. Sarcomere
2. Muscle fiber
3. Actin
4. None
The type of muscles present in our:
1. | upper arms are smooth muscle fibres fusiform in shape |
2. | heart is involuntary and unstriated smooth muscles |
3. | intestine are striated and involuntary |
4. | thighs are striated and voluntary |
Which one of the following pairs of chemical substances, is correctly categorised?
1. | Pepsin and prolactin - Two digestive enzymes secreted in the stomach |
2. | Troponin and myosin - Complex proteins in striated muscles |
3. | Secretin and rhodopsin - Polypeptide hormones |
4. | Calcitonin and thymosin - Thyroid hormones |
Match the following columns and select the correct option:
Column I | Column II | ||
(a) | Gout | (i) | Decreased levels of estrogen |
(b) | Osteoporosis | (ii) | Low Ca++ ions in the blood |
(c) | Tetany | (iii) | Accumulation of uric acid crystals |
(d) | Muscular dystrophy | (iv) | Autoimmune disorder |
(v) | Genetic disorder |
Options: | (a) | (b) | (c) | (d) |
1. | (ii) | (i) | (iii) | (iv) |
2. | (iii) | (i) | (ii) | (v) |
3. | (iv) | (v) | (i) | (ii) |
4. | (i) | (ii) | (iii) | (iv) |
Assertion (A): | Osteoporosis is characterised by decreased bone mass and increased chances of fractures. |
Reason (R): | Common cause of osteoporosis is increased levels of estrogen. |
1. | (A) is not correct but (R) is correct. |
2. | Both (A) and (R) are correct and (R) is the correct explanation of (A). |
3. | Both (A) and (R) are correct but (R) is not the correct explanation of (A). |
4. | (A) is correct but (R) is not correct. |