- 1(current)
Q. No.Which of these happen(s) in muscle contraction?
Choose the correct answer from the options given below:
1. A and B only
2. A and C only
3. A, B and C only
4. D only
| A. | Increase in Ca++ concentration level leads to the binding of calcium with a subunit of troponin on actin filaments. and thereby removes the masking of active sites for myosin. |
| B. | During the shortening of the muscle, A-bands get reduced, whereas, the I-bands retain the length. |
| C. | A muscle fibre is a syncytium. |
| D. | Isotropic band of a myofibril consists of myosin. |
1. A and B only
2. A and C only
3. A, B and C only
4. D only
Subtopic: Â Muscle Contraction: Other Considerations |
 86%
Level 1: 80%+
Hints
Assertion (A): Cori-cycle prevents lactic acidosis in muscles under anaerobic condition.
Reason (R): Cori-cycle converts lactic acid of muscles into glucose in liver.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false
Reason (R): Cori-cycle converts lactic acid of muscles into glucose in liver.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false
Subtopic: Â Energy for Muscle Contraction |Â Muscle Contraction: Other Considerations |
 66%
Level 2: 60%+
Hints
Find out the true (T)/false (F) statements and choose the correct option:
I. The phosphagen in the vertebrate muscle is arginine phosphate
II. The accumulation of phosphoenol pyruvic acid in muscles cause fatigue
III. Cori cycle occurs in liver and muscle
IV. ATP is synthesised in the muscle by the phosphorylation of ADP by a phosphagen
I. The phosphagen in the vertebrate muscle is arginine phosphate
II. The accumulation of phosphoenol pyruvic acid in muscles cause fatigue
III. Cori cycle occurs in liver and muscle
IV. ATP is synthesised in the muscle by the phosphorylation of ADP by a phosphagen
| Options | I | II | III | IV |
| 1. | T | T | F | F |
| 2. | F | F | T | T |
| 3. | T | F | T | F |
| 4. | F | T | F | F |
Subtopic: Â Muscle Contraction: Other Considerations |
 62%
Level 2: 60%+
Hints
- 1(current)
Q. No.
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