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Class 11 Biology · Chapter 12 · Test 6

Muscle Contraction and Disorders

47 MCQs. This part covers the sliding filament model of muscle contraction and the cross-bridge cycle. It also covers the origin and insertion of muscles, antagonistic muscles and the movement of the knee joint, and muscle fatigue, cramps, tetany and tetanus. It ends with the skeleton as rods and levers, why muscles pull but do not push, and exercise MCQs 7 to 12.

MCQs

47 questions · 40 min · 47 marks

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Sample questions

The first 5 of 47. Try each one, then tap to see the answer.

  1. Question 1

    According to the sliding filament model a muscle contracts when:

    • AThin myofilaments slide past thick ones
    • BThick filaments shorten
    • CThin filaments shorten
    • DZ-lines disappear
    Show answer

    Answer: A

    Thin filaments slide past the thick ones so that they overlap to a greater degree.

  2. Question 2

    In a relaxed muscle the myosin heads are not bound to actin because binding sites are blocked by:

    • ATropomyosin
    • BATP
    • CCalcium
    • DMyosin
    Show answer

    Answer: A

    Tropomyosin blocks the binding sites on actin.

  3. Question 3

    In the relaxed state the myosin heads have hydrolysed ATP into:

    • AADP and Pi
    • BAMP only
    • CGlucose
    • DCalcium
    Show answer

    Answer: A

    Myosin heads have hydrolysed ATP into ADP and Pi.

  4. Question 4

    The neurotransmitter released by the motor neuron at the synapse is:

    • AAcetylcholine
    • BAdrenaline
    • CInsulin
    • DDopamine
    Show answer

    Answer: A

    Acetylcholine is released by the motor neuron.

  5. Question 5

    A nerve impulse travels along the sarcolemma to the T-tubules and then to the:

    • ASarcoplasmic reticulum
    • BZ-line
    • CTendon
    • DMyofibril only
    Show answer

    Answer: A

    It travels to the T-tubules and then the sarcoplasmic reticulum.

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