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CHAPTER-19 EXCRETORY PRODUCTS AND THEIR ELIMINATION
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CHAPTER-19 EXCRETORY PRODUCTS AND THEIR ELIMINATION
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CBSE Quick Revision Notes (Class-11 Biology)CHAPTER-19 EXCRETORY PRODUCTS AND THEIR ELIMINATION
• Elimination of metabolic wastes products from the animal body to regulate the composition
of body fluids and tissues is called excretion. These wastes products includes ammonia, uric
acid, urea, carbon dioxide and ions like Na+, K+, Cl- and phosphates and sulphate.
• Ammonia is the most toxic and uric acid is the least toxic. The process of removing ammonia
is called ammonotelism and organisms that excrete ammonia are called ammonotelic
(bony fishes, aquatic amphibians and insects).
• The organism that release urea as nitrogenous wastes are called ureotelic (mammals,
terrestrial amphibians). The organism that excretes uric acids are called urecotelic
(reptiles, birds and land snails).
Animals Excretory organs
Flat worms, some annelids and cephalochordates. Protonephridia or flame cells.
Earthworms and annelids Nephridia
Insects including cockroaches Malpighian tubules
Mammals Kidney
Human Excretory System
Human excretory system consists of
i. A pair of kidneys
ii. A pair of ureters
iii. A urinary bladder
iv. A urethra
Kidneys are reddish brown bean shaped structure
situated between last thoracic and lumber vertebra.
Each with a notch on its inner side called hilum
through which ureter, blood vessels and nerves
enter.
Inside the hilum has broad funnel shaped space called
renal pelvis with projection called calyces.
Inside the kidney are two zone- outer cortex and inner
medulla. Medulla is divided into medullary pyramids
projecting into calyx.
Cortex extends between medullary pyramids as renal
column called Columns of Bertini.
The functional unit of kidney is nephron. Each kidney contains about one million nephrons.
Each nephron had two parts- the glomerulus and renal tubules. Glomerulus is the tuft of
capillaries formed by afferent arteriole. Blood from glomerulus is carried away by efferent
arteriole.
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