Edexcel A-Level Biology A2 7.10 Skeletal Muscle Fibre and Twitch Types Questions

Compare fast and slow twitch fibres using contraction speed, glycogen and phosphocreatine stores, mitochondria, myoglobin and capillary supply in athlete contexts.

Exam points

compare fast and slow twitch fibres using athlete, distance or activity evidence
explain rapid contraction through fibre diameter, glycogen and phosphocreatine stores
link mitochondria, capillaries and myoglobin to sustained aerobic ATP supply

[Maximum number: 5]

Movement in mammals results from interactions between muscles, tendons, ligaments and bones.

(a)

The photograph shows part of a skeletal muscle fibre as seen using an electron microscope.

Figure for Question (a) — Edexcel A-Level Biology A2

[ 5 ]

(i)

Which pair of letters represents the length of one sarcomere?

P to T

P to U

Q to T

R to S

[ 1 ]

(ii)

Describe how the structure of a fast twitch muscle fibre differs from a slow twitch muscle fibre.

[ 4 ]

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Edexcel A-Level Biology A2 7.10 Skeletal Muscle Fibre and Twitch Types Questions question 1

Question (a)

Question (i)

Question (ii)