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Locomotion and Movement Test - 33

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Locomotion and Movement Test - 33
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  • Question 1
    1 / -0
    Which one of the following is marked correctly?

    Solution
    • Each myofibril(a unit of the muscle cell) has alternate dark and light bands on it.
    • The light bands contain actin and are called I-band or Isotropic band, whereas the dark band called ‘A’ or Anisotropic band contains myosin.
    • In the centre of each ‘I’ band is an elastic fibre called ‘Z’ line which bisects it. The thin filaments are firmly attached to the ‘Z’ line.
    • So, the correct answer is a → Z-line -located at centre of I-band.
  • Question 2
    1 / -0
    H-zone in skeletal muscle fibre is due to
    Solution
    • Myofibril is made up of two types of filaments. They are thin filament(actin) and thick filament(myosin).
    • The light bands contain actin and are called I-band or Isotropic band, whereas the dark band called ‘A’ or Anisotropic band contains myosin. The ‘A’ and ‘I’ bands are arranged alternately throughout the length of the myofibrils.
    •  In a resting state, the edges of thin filaments on either side of the thick filaments partially overlap the free ends of the thick filaments leaving the central part of the thick filaments. This central part of thick filament, not overlapped by thin filaments is called the ‘H’ zone.
    • Hence H-zone in skeletal muscle fibre is due to Central gap between actin filaments extending through myosin filaments in A-band.
    • So, the correct answer is 'Central gap between actin filaments extending through myosin filaments in A-band'.
  • Question 3
    1 / -0
    Skeletal muscles are controlled by
    Solution
    Correct option: A
    Explanation: 
    • Muscular tissue is required for the proper movement of the body.
    • The major 3 types of muscles are- Skeletal, cardiac and smooth muscles.
    • Skeletal muscles are under our control.
    • The skeletal muscles are under the control of the somatic nerves. 
    Hence, skeletal muscles are controlled by "somatic nerves"
  • Question 4
    1 / -0
    The ciliary body is located.
  • Question 5
    1 / -0
    In myasthenia gravis, acetylcholine
    Solution
    • Myasthenia gravis a chronic autoimmune disease in which weakness of the skeletal muscles of the body occurs. 
    • In Myasthenia gravis, antibodies block the receptors for acetylcholine at the synapse, which prevents muscle contraction.
    Therefore, the correct answer is option A.

  • Question 6
    1 / -0
    Organ of Golgi is the sensing structure formed at the junction of
    Solution
    Organ of Golgi. also known as Golgi tendon organ is a kind of proprioreceptor that sense stimulus within the body. It receives information from the tendons and sense tension in muscles. These kind of receptors get activated when the muscles stretch or contract due to any activity. These receptor are made up of collagen strands and formed at the junction of muscle and tendon.
    So, the correct answer is 'Muscle and tendon'.
  • Question 7
    1 / -0
    Which one of the following is wrongly matched?
    Solution
    A. Myosin are made up of polymerised protein which make thick myofilament. They are found in A- band of sarcomere and are contractile protein.
    B. Tendon is dense regular connective tissue which join muscle to bone and made up of white collagen fibres.
    C. Smooth muscle is non striated muscle with tapering ends and spindle shaped. They are involuntary muscles which are not under control and do not get fatigue.
    D. Thin myofilament is made up of three proteins - actin, tropomyosin and troponin. Actin is a globular protein. Tropomyosin is a fibrous protein. At regular intervals of tropomyosin, a complex protein called troponin. It is a trimeric protein having three units - troponin I, troponin T and troponin C.
    So, the correct answer is 'Troponin-fibrous protein'.
  • Question 8
    1 / -0
    Malleolus is a
    Solution
    • A bony prominence on each side of the human ankle is called malleus.
    • Each leg is supported by two bones, the tibia on the inner side (medial) of the leg and the fibula on the outer side (lateral) of the leg.
    • The prominence on the inner side of the ankle, formed by the lower end of the tibia is called  medial malleolus
    • The lateral malleolus is the prominence on the outer side of the ankle, formed by the lower end of the fibula. 
    • Hence malleus is a Prominence at end of tibia and fibula'.
    • So, the correct answer is 'Prominence at end of tibia and fibula'
  • Question 9
    1 / -0
    Sarcomere is the functional unit of contraction in a muscle fibre. Identify the portion of myofibril that constitutes a sarcomere
    Solution
    • The ‘A’ and ‘I’ bands are arranged alternately throughout the length of the myofibrils. The light bands contain actin(thin filament) and are called I-band or Isotropic band, whereas the dark band called ‘A’ or Anisotropic band contains myosin(thick filament).
    •  In the centre of each ‘I’ band is an elastic fibre called ‘Z’ line which bisects it. The thin filaments are firmly attached to the ‘Z’ line. The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere Sarcomere is considered as the functional unit of contraction in a muscle fibre.
    • So, the correct answer is 'Portion of a myofibril between two successive Z-lines'.
  • Question 10
    1 / -0
     Disease caused by deficiency of parathormone is
    Solution
    Tetany is rapid spasms in muscles due to low calcium ions in the body fluid or blood. Hyposecretion of parathormone lowers concentration of calcium ions in the blood due to excretion of calcium in urine, this increases the excitability of nerves and muscles, causing cramp and convulsions, this disorder is known as tetany. 
    So the correct answer is 'Tetany'.
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