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In Biology / College | 2025-07-05

What happens to the I bands during muscle contraction according to the sliding filament theory?
A) The I bands shorten.
B) The I bands lengthen.
C) The I bands disappear completely.
D) The I bands stay the same length.

Asked by jnorton1024

Answer (2)

During muscle contraction, the I bands shorten due to the sliding of actin filaments over myosin filaments. The contraction causes the Z discs to move closer together, narrowing the I bands. This is a fundamental aspect of the sliding filament theory. ;

Answered by GinnyAnswer | 2025-07-05

During muscle contraction, the I bands shorten according to the sliding filament theory. This occurs as actin filaments slide toward each other, resulting in the Z discs moving closer together. Therefore, the correct answer is A) The I bands shorten.
;

Answered by Anonymous | 2025-07-10

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