Excretion in Human | Class X

The human body has specialised organs for the removal of various waste products formed in the body. These organs are:

1. Large intestine:  The undigested food is removed from the large intestine and expelled out of the body through the anus in the form of faeces.

2. Lungs: Carbon dioxide is produced as a waste roduct in our body cells during the Enacess of 3 respiration (breakdown of- food to release energy)• This carbon dioxide is removed by the lungs during exhalation.

3. Skin:  Our skin helps in eliminating excess melaboiic water, urea, some salts and otherwastes in the form of at Sweat is a liquid waste, secreted from the sweat glands below the skin. Thus, sweating performs two functions:

(a) It helps remove excess water, some salts, urea, as liquid waste (sweat) from the body.

(b) It helps keep our body cool during summers. when sweat evaporates from our body, it takes with it the heat required for evaporation from our body. In this way, our body loses heat and makes us feel cool (cooling due to evaporation). Sometimes, on a hot summer day, we see white patches are formed on our clothes especially in areas like underarms. These white patches are formed by the salts left on the clothes when the water present in the sweat evaporates.

4.Kidneys: Kidneys are the main excretory 'organs in our body. They help in eliminating urea, waste salts and excess water from the blood in the form of urine.


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