During contraction of muscles following do not take place :-(a) Shortening of sarcomere (b) Shortening of A-band(c) Shortening of actin (d) Shortening of myosin
Question
During contraction of muscles following do not take place :-(a) Shortening of sarcomere (b) Shortening of A-band(c) Shortening of actin (d) Shortening of myosin
Solution
The correct answer is (b) Shortening of A-band.
Here's why:
Muscle contraction is a complex process that involves several structures within the muscle fiber. The sarcomere, actin, and myosin all play key roles in this process.
(a) Shortening of sarcomere: During muscle contraction, the sarcomeres within the muscle fibers do shorten. This is due to the sliding filament theory where the actin (thin filament) and myosin (thick filament) slide past each other, causing the sarcomere to shorten.
(b) Shortening of A-band: The A-band is the region of the sarcomere that contains the entire length of the myosin filament and overlapping portions of actin filaments. During muscle contraction, the A-band does not shorten. Instead, the I-band (the region containing only actin filaments) and H-zone (the region containing only myosin filaments) shorten.
(c) Shortening of actin: The actin filaments do not actually shorten during muscle contraction. Instead, they slide over the myosin filaments, giving the appearance of shortening.
(d) Shortening of myosin: Similar to actin, the myosin filaments do not actually shorten. They pull the actin filaments towards the center of the sarcomere, giving the appearance of shortening.
Similar Questions
Which event does not happen during muscle contraction ?Actin filaments move towards H-zone Decreased length of myosin filament Decreased length of sarcomereLength of A-band remains unchanged.
he following is a list of the events that occur during a muscle contraction.1. Myosin cross-bridges bind to the actin.2. The free myosin head splits ATP.3. Calcium ion is released from the sarcoplasmic reticulum.4. The myosin head pivots toward the center of the sarcomere.5. Calcium ion binds to troponin.6. The myosin head binds an ATP molecule and detaches from the actin.The correct sequence of these events isQuestion 10Select one:a.3, 5, 1, 2, 4, 6.b.1, 3, 5, 4, 6, 2.c.1, 4, 6, 2, 3, 5.d.3, 5, 1, 4, 6, 2.e.5, 1, 4, 6, 2, 3.
Which of the following happens as actin and myosin filaments slide past each other during muscle contraction?
What is the name for the linkage that forms between actin and myosin during muscle contraction?
During contraction of muscles following do not take place :-
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