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

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Actin	Myosin
1. It is thin low molecular weight filamentous protein present in the sarcomere.	1. It is thick filamentous protein present in the sarcomere.
2. It occurs in two forms the monomeric G-actin and polymeric F-actin.	2. Each myosin molecule has two components—a tail and head. The tail is formed of heavy meromyosin (HMM) while the head is formed of light meroyosin LMM.
3. The contractile protein called tropomyosin.	3. The head has contractile property.
4. It does not act as ATPase	4. The head acts as ATPase.