What makes you feel tired?, English General Knowledge Essay, Paragraph and Speech for class 8, 9, 10 and 12 Class, Competitive Exam.

What makes you feel tired?

When you work, you have to use your muscles. When the muscles move, they produce a substance called sarcolactic acid.’ The same substance is also found in your blood. When too much of this sarcolactic acid is formed because of too much work, all the muscles in your body become tired.

When you are sleeping or resting the muscles are relaxed and the acid is removed from the muscles and blood. New cells are formed, blood is cleaned, and joints are lubricated. You again feel fresh and energetic.

Some other substances in the body also make us feel tired. These are called ‘fatigue toxins.’ These are also created in our bodies when we work. Our blood carries these toxins to all parts and not only the muscles, but all other parts, even the brain feels tired.

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