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Locomotion and Movement

Short Answer Type

71. What is dislocation and fracture ?

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Long Answer Type

72. Explain the important types of movements

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Short Answer Type

73.

Explain Muscular Fatigue

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Long Answer Type

74.

Answer the following briefly :

(a) How does a muscle shorten during its contraction and lengthen during its relaxation?

(b) What biological functions are served by the skeletal system ?

(c) Why a red muscle fibre can work for a prolonged period while a white musule fibre suffers from fatigue after a shorter work ?

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75. Explain the structure of muscle fibre.

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Short Answer Type

76. What is a cramp?

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77. Briefly explain hypertrophy and atrophy.

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78. Why does the muscle fibre appear striped?

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79.

How are the thick and thin filaments arranged ?

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80. Explain the structure of actin proteins?

Each actin filament is made of two ‘F’ or filamentous actins. These are helically wound to each other. The ‘F’ actin is a polymer of monomeric
‘G’ (Globular) actins. Two filaments of another protein, tropomyosin are also present close to the ‘F’ actins throughout its length. Troponin a complex protein is found at regular intervals on the tropomyosin.

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