Skeletal Muscles (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What type of movement does skeletal muscle control?
What type of movement does skeletal muscle control?
Voluntary movement
What is the correct hierarchical order from smallest to largest in skeletal muscle?
What is the correct hierarchical order from smallest to largest in skeletal muscle?
Myofibrils → muscle fibres → muscle
Why have muscle cells fused together to form elongated fibres?
Why have muscle cells fused together to form elongated fibres?
To eliminate weak junction points
What does sarcoplasm contain high concentrations of?
What does sarcoplasm contain high concentrations of?
Mitochondria & endoplasmic reticulum
What structural feature do myosin filaments have?
What structural feature do myosin filaments have?
Rod-shaped tails with bulbous heads
What do I bands contain and how do they appear?
What do I bands contain and how do they appear?
Only actin filaments; lighter colour
What defines a sarcomere?
What defines a sarcomere?
Distance between two adjacent Z-lines
What role does tropomyosin play in muscle?
What role does tropomyosin play in muscle?
Regulatory role in contraction
Which adaptation helps slow-twitch fibres perform endurance activities?
Which adaptation helps slow-twitch fibres perform endurance activities?
Large myoglobin stores & many mitochondria
What allows fast-twitch fibres to generate immediate ATP during intense activity?
What allows fast-twitch fibres to generate immediate ATP during intense activity?
Phosphocreatine stores