Q2 of 48 Page 104

Why is excretion necessary? Name the common excretory substances in our body.

Numerous waste products are formed during the metabolic activities that take place in the body. These products become toxic or harmful if retained inside the body. Large amounts of carbon dioxide and water are produced by metabolism of carbohydrates, fats, and protein. Nitrogenous wastes such as ammonia, urea, uric acid etc. are formed in the metabolism of proteins and other complex nitrogenous compounds.


These waste products have to be expelled from the body so that they do not do us any harm. The common excretory substances include carbon dioxide, water, urea etc.


More from this chapter

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3

In each one of the following sets of body parts or substances or processes, pick out the one item which overall includes the remaining four

(a) Glomerular filtrate, Bowman's capsule, ultrafiltration, glomerulus, blood plasma.


(b) Skin, liver, lungs, kidneys, excretion.


(c) ADH, water, pituitary, osmoregulation, urine.


(d) CO2, bile pigments, water, excretion, urea.

 1

Write down the functional activity of the following parts,

(a) Glomerulus ___________


(b) Henle's loop ___________


(c) Ureter ___________


(d) Renal artery ___________


(e) Urethra ___________

 3

What is a uriniferous tubule? How does it function?

 4

Why is it necessary to maintain a normal osmotic concentration of the blood?