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During the muscle contraction, which zone decreases?

a)

I-zone

b)

Z-zone

c)

H-zone

d)

M-zone


Question ID - 5210 | Toppr Answer

During the muscle contraction, which zone decreases?

a)

I-zone

b)

Z-zone

c)

H-zone

d)

M-zone

1 Answer - 5876 Votes

3537

Answer Key : (c) -

(c)

According to sliding filament theory, when a fibril contracts its ‘A’ bands remain intact, while the ‘I’ bands progressively shorten and eventually disappear. At this stage, ‘H’ zones also disappear because the active filaments of both the sides in each sarcomere may even overlap each other that the ‘M’ line and ‘Z’ lines and touch the ends of myosin filaments.



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