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81. What is oxygen debt ?

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82. Write a note on smooth muscle fibres.

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83. Describe cardiac muscle fibres.

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There are 3 main types of muscles.

1. Striated muscle fibres or skeletal muscles.

2. Unstriped or smooth muscle fibres or visceral muscles.

3. Cardiac muscles

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85.

Discuss the mechanism of muscular contraction.

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86. Write the names of the factors which are responsible for osteoporosis.

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87. Why are movements and locomotion necessary among the animals ?

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88. How does calcium affect the process of muscle contraction ?

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89. How do the joints help in movement? Explain.

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90. Write differences between
(a) Actin and Myosin

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