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During muscle contraction in humans the
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Increase in level into the sarcoplasm leads to the binding of calcium with a subunit of troponin on actin filaments and there by remove the masking of active sites for myosin. Utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge. This pulls the attached actin filaments towards the centre of ‘A’ band. The ‘Z’ line attached to these actions are also pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction. It is clear from the above steps, that during shortening of the muscle, i.e., contraction, the ‘I’ bands get reduced, whereas the ‘A’ bands retain the length.
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Question Text | During muscle contraction in humans the |
Updated On | Mar 21, 2023 |
Topic | Locomotion and Movement |
Subject | Biology |
Class | Class 11 |
Answer Type | Text solution:1 Video solution: 1 |
Upvotes | 190 |
Avg. Video Duration | 2 min |