a. | ‘H’ zone decreases in length and disappears on full relaxation |
b. | A band remains unchanged |
c. | I band gets reduced in length due to decrease in length of actin filaments |
d. | Myosin hydrolyses ATP, releasing ADP and P1 |
e. | Z- lines move away from each other |
(a) | Binding of calcium with the subunit of tropomyosin removes the masking of active sites for myosin |
(b) | Z-lines move towards the centre of ‘H’ zone |
(c) | Cross bridge is formed by utilising the energy from hydrolysis of ATP |
(d) | H-zone disappears when a muscle fibre is maximally contracted |
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