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Musculoskeletal System
Muscle Physiology: Skeletal Muscle Contraction
Premed Biology Muscle Contraction Mus 068

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Which sarcomere region contains ONLY thin (actin) filaments and no thick filaments?

medium

AA band

I band

CH zone

DM line

EAll regions contain both filaments equally

Explanation

The I band is thin-filament only. The A band contains thick filaments (and overlap regions). The H zone is thick-only (no thin overlap).

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