Excretory Products & their Elimination PPT Biology Class 11

 Page 1


EXCRETORY PRODUCTS AND 
THEIR ELIMINATION
Page 2


EXCRETORY PRODUCTS AND 
THEIR ELIMINATION
Ammonotelic:elimination of nitrogenous waste in the form of 
ammonia.(fish)
Ureotelic: elimination of nitrogenous waste in the form of 
urea.(Amphibia and mammalian)
Uricotelic: elimination nitrogenous waste in the form of uric 
acid. (Reptilia,bird and insects)
Page 3


EXCRETORY PRODUCTS AND 
THEIR ELIMINATION
Ammonotelic:elimination of nitrogenous waste in the form of 
ammonia.(fish)
Ureotelic: elimination of nitrogenous waste in the form of 
urea.(Amphibia and mammalian)
Uricotelic: elimination nitrogenous waste in the form of uric 
acid. (Reptilia,bird and insects)
Excretory 
organs
Protonephridia or flamecells – Platyhelminthes(Planaria), 
rotifers, some annelids and cephalochordates (Amphioxus)
Nephridia: annelid.
Malpighian tubules – insects
Antennal gland or green glands – crustacean like prawn.
Page 4


EXCRETORY PRODUCTS AND 
THEIR ELIMINATION
Ammonotelic:elimination of nitrogenous waste in the form of 
ammonia.(fish)
Ureotelic: elimination of nitrogenous waste in the form of 
urea.(Amphibia and mammalian)
Uricotelic: elimination nitrogenous waste in the form of uric 
acid. (Reptilia,bird and insects)
Excretory 
organs
Protonephridia or flamecells – Platyhelminthes(Planaria), 
rotifers, some annelids and cephalochordates (Amphioxus)
Nephridia: annelid.
Malpighian tubules – insects
Antennal gland or green glands – crustacean like prawn.
HUMANEXCRETORYSYSTEM
Human excretory system consists of
A pair of kidney 
A pair ofureters
A urinary bladder 
A urethra
thoracic vertebra close to dorsal inner wall of the abdominalcavity. 
Each kidneymeasures 10-12cm in length,5-7 cm in width,2-3 cmin 
thickness.
Towards the centre of inner concave surface is a notch, called hilum
through which ureters, blood vessel and nerves enter into the kidney.
Page 5


EXCRETORY PRODUCTS AND 
THEIR ELIMINATION
Ammonotelic:elimination of nitrogenous waste in the form of 
ammonia.(fish)
Ureotelic: elimination of nitrogenous waste in the form of 
urea.(Amphibia and mammalian)
Uricotelic: elimination nitrogenous waste in the form of uric 
acid. (Reptilia,bird and insects)
Excretory 
organs
Protonephridia or flamecells – Platyhelminthes(Planaria), 
rotifers, some annelids and cephalochordates (Amphioxus)
Nephridia: annelid.
Malpighian tubules – insects
Antennal gland or green glands – crustacean like prawn.
HUMANEXCRETORYSYSTEM
Human excretory system consists of
A pair of kidney 
A pair ofureters
A urinary bladder 
A urethra
thoracic vertebra close to dorsal inner wall of the abdominalcavity. 
Each kidneymeasures 10-12cm in length,5-7 cm in width,2-3 cmin 
thickness.
Towards the centre of inner concave surface is a notch, called hilum
through which ureters, blood vessel and nerves enter into the kidney.
HUMANEXCRETORYSYSTEM
Inner to hilum is abroad funnel shaped space 
called renal pelvis with projections called calyces. 
The outer wall of kidneyis a tough capsule.
Internally the kidney is differentiated into outer cortex and inner
medulla.
The medulla is divided into a fewconical masses called medullary 
pyramids.
Pyramidsprojected into the calyces.
The cortex extendedin-between the medullarypyramids as renal 
columns called columns of Bertini.