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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

Muscular fatigue : is the decline in ability of a muscle to generate force. It can be a result of vigorous exercise but abnormal fatigue may be caused by barriers to or interference with the different stages of muscle contraction. It happens when the muscles respire anaerobically and produce lactic acid. The accumulation of lactic acid leads to 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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