Which fibre is white in colour?

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Study for the Advanced Subsidiary WJEC Physical Education Test. Engage with flashcards and multiple-choice questions, each providing hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

Which fibre is white in colour?

Explanation:
White fibres are the fast-twitch type used for short, explosive efforts. They have less myoglobin and fewer capillaries than red, slow-twitch fibres, so they appear paler and fatigue more quickly because they rely mainly on anaerobic energy for rapid bursts of power. Among the options, the description that points to the fast-twitch group identifies white fibres most clearly, which is the Type 2 fibres category. While a subtype like Type 2b is especially pale, the general label used in this context is Type 2 fibres to denote the fast-twitch, lighter-coloured category. In contrast, Type 1 are red and slow-twitch, and Type 2a are fast but more pink/red due to higher oxidative capacity.

White fibres are the fast-twitch type used for short, explosive efforts. They have less myoglobin and fewer capillaries than red, slow-twitch fibres, so they appear paler and fatigue more quickly because they rely mainly on anaerobic energy for rapid bursts of power. Among the options, the description that points to the fast-twitch group identifies white fibres most clearly, which is the Type 2 fibres category. While a subtype like Type 2b is especially pale, the general label used in this context is Type 2 fibres to denote the fast-twitch, lighter-coloured category. In contrast, Type 1 are red and slow-twitch, and Type 2a are fast but more pink/red due to higher oxidative capacity.

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