- 1(current)
Q. No.Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
| 1. | Calcium | 2. | Magnesium |
| 3. | Sodium | 4. | Potassium |
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
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Identify the protein that is not associated with others when the skeletal muscle is relaxed:
| 1. | Actin | 2. | Myosin |
| 3. | Tropomyosin | 4. | Troponin |
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The critical event for the contraction of striated muscles would be that calcium ions:
1. are released from troponin C
2. bind to tropomyosin
3. bind to troponin
4. are taken up by the sarcoplasmic reticulum
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Hydrolysis of ATP by myosin head is critical for the cross bridge formation. |
| Reason (R): | Myosin head has ATPase activity dependent on magnesium ions |
In the light of the above statements choose the correct answer from the options given below:
| 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. |
The neurotransmitter released by the motor neurons at the neuromuscular junction is:
| 1. | Acetylcholine | 2. | Noradrenaline |
| 3. | GABA | 4. | Adrenaline |
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- 1(current)
Q. No.
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