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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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84. Write the names of different types of 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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Joints are the point of contact between bones or between bones and cartilages.

Role of joints in movement :

1. Movement takes place along the joints which act as fulcrum of the lever.

2. They help in locomotion and many other movements.

3. They help to connect a bone to a bone allowing movemnt.

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90. Write differences between
(a) Actin and Myosin

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