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Locomotion and ...

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  • Question 1
    4 / -1

    The slow twitch muscle fibres which are rich in myoglobin and have abundant mitochondria are

  • Question 2
    4 / -1

    The figures given here represent three different conditions of sarcomeres. Identify these conditions and select the correct option.

  • Question 3
    4 / -1

    Which of the following is the contractile protein of a muscle?

  • Question 4
    4 / -1

    If a stimulus, several times greater than the threshold stimulus is provided to a muscle fibre, it will

  • Question 5
    4 / -1

    Which of the following ions help in muscle contraction?

  • Question 6
    4 / -1

    In a muscle undergoes rapid contraction and relaxation, the sarcoplasmic reticulum extension

  • Question 7
    4 / -1

    Which of the following is incorrect regarding muscle contraction?

  • Question 8
    4 / -1

    Myoglobin is present in

  • Question 9
    4 / -1

    Which of the following is correct regarding changes in muscle fibre from relaxed to contracted state in the given figure?

  • Question 10
    4 / -1

    In the resting muscle fibre, tropomyosin partially covers

  • Question 11
    4 / -1

    Which one of the following options shown the next stage of muscle contraction after the stage given in question?

  • Question 12
    4 / -1

    During muscular contraction, which of the following events occur?
    (I) H-zoned is disappeared
    (ii) A band widens
    (iii) I band reduces in width
    (iv) Width of A band is unaffected
    (v) M line and Z line come closer.

  • Question 13
    4 / -1

    Which of the following is the most abundant mineral element in the skeletal muscle?

  • Question 14
    4 / -1

    Following is given a randomly arranged list of events that occur at neuromuscular junction to trigger muscle contraction.
    (i) Receptor sites on sarcolemma
    (ii) Nerve impulse
    (iii) Release of Ca+2 from sarcoplasmic reticulum
    (iv) The neurotransmitter acetylcholine is released
    (v) Sarcomere shortern
    (vi) Synaptic cleft
    (vii) Spread of impulses over sarcolemma on TT-tubules
    Which of the following gives the correct sequence of these steps?

  • Question 15
    4 / -1

    Which of the following is a source of energy for muscle contraction?

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