Excretion in human beings class 10th

  • Excretion is the process by which the waste products produced during metabolic activities is removed from the body.
  • In unicellular organism the waste products are removed from the cells into the surroundings by diffusion.
  • In multicellular organisms the waste prducts are removed through specialised organs.

Excretion in Human beings :-

Table of Contents

  • The excretory system consists of a pair of kidneys , a pair of ureters, urinary bladder and urethra. Each kidney has a number of excretory units called nephrons.
  • Nephron :-
  • Each nephron has a cup like structure called Bowman’s capsule containing a bundle of capillaries called glomerulus. The Bowman’s capsule leads into a tubular structure which joins into a collecting duct. The renal artery brings the nitrogenous waste like ammonia, urea, uric acid (urine) along with excess water, salts etc. into the nephron. It filters the nitrogenous waste, water and salts which passes through the tubular structure into the collecting duct. The waste then passes through the ureters into the urinary bladder and is then sent out through the urethra
  • as urine.
  • The useful products like amino acids, glucose, salts etc. are reabsorbed by the capillaries around the tubular structure and goes into the real vein.
  • b) Excretion in plants :-
  • In plants the gaseous waste products produced during respiration (CO2) and photosynthesis (O2) are removed through the stomata. Excess water is removed through the stomata. This process is called transpiration.
  • Some waste products are stored in the leaves and removed when the leaves dry and fall off. Some waste products are stored in vacuoles. Some waste products like gums and resins are stored in the old xylem cells. Some waste products are removed through them

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