Which region is the light area consisting of thin filaments only?

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Study for the Ivy Tech APHY 101 Muscle System Test. Dive into comprehensive questions with clear hints and explanations, boosting your confidence for the exam!

Multiple Choice

Which region is the light area consisting of thin filaments only?

Explanation:
The light region that contains only thin filaments is the I band. It lies between two Z discs and is made up mainly of actin filaments (thin fibers) with no thick myosin filaments overlapping in that space, which is why it looks lighter under a microscope. In contrast, the A band contains the entire length of thick filaments and the overlapping thin filaments, and the central part of the A band—the H zone—has only thick filaments. During contraction, actin filaments slide inward, shortening the I band while the A band stays the same length.

The light region that contains only thin filaments is the I band. It lies between two Z discs and is made up mainly of actin filaments (thin fibers) with no thick myosin filaments overlapping in that space, which is why it looks lighter under a microscope. In contrast, the A band contains the entire length of thick filaments and the overlapping thin filaments, and the central part of the A band—the H zone—has only thick filaments. During contraction, actin filaments slide inward, shortening the I band while the A band stays the same length.

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