Multiple choice

Myoglobin is present in _________.

  1. all muscle fibres

  2. white muscle fibres

  3. red muscle fibres

  4. both red and white muscle fibres
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Myoglobin is an oxygen-binding protein found predominantly in red muscle fibers (slow-twitch fibers), which are specialized for sustained aerobic activity and endurance. These fibers appear red due to high myoglobin content and mitochondrial density. White muscle fibers (fast-twitch) rely on glycogen and have little myoglobin as they're meant for quick, anaerobic bursts.

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