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| Muscle Fatigue |
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| The muscle fibres are excited and contracted in response to motor nerve impulse. The duration for which a muscle can remain contracted depends on its ability to supply ATP. |
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| Energy to the contractile proteins |
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| As the ATP supply decreases, the force of contraction of the muscle fibre decreases and they ultimately stop responding. Thus, this reduction in the force of contraction of a muscle after prolonged stimulation is called muscle fatigue. |
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| Fatigue is primarily caused due to an excess deposition of lactic acid in the muscle fibre, due to anaerobic glycolysis of glycogen to produce energy required to regenerate the ATP. This lactic acid is not disposed off without oxygen. Thus the muscle fibre gets fatigued sooner. |
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| A muscle fibre also gets fatigued due to strenuous exercise than by mild exercise because the lactic acid formation is faster than that of its oxidation. |
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| Red and white muscles |
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| The skeletal muscles of the vertebrates are of two types i,e tonic or red or slow muscle and twitch or white or fast muscles. |
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| A muscle may consist of only tonic fibres or only twitch fibres, or a mixture of both. |
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| The charateristics of the two muscles are given below: |
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Movement and Locomotion in Animals
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