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 flame cells – 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 flame cells – Platyhelminthes (Planaria), 
rotifers, some annelids and cephalochordates (Amphioxus)
• Nephridia: annelid.
• Malpighian tubules – insects
• Antennal gland or green glands – crustacean like prawn.
HUMAN EXCRETORY SYSTEM
Human excretory system consists of
A pair of kidney
A pair of ureters
A urinary bladder
A urethra
thoracic vertebra close to dorsal inner wall of the abdominal cavity.
Each kidney measures 10-12 cm in length, 5-7 cm in width, 2-3 cm in 
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 flame cells – Platyhelminthes (Planaria), 
rotifers, some annelids and cephalochordates (Amphioxus)
• Nephridia: annelid.
• Malpighian tubules – insects
• Antennal gland or green glands – crustacean like prawn.
HUMAN EXCRETORY SYSTEM
Human excretory system consists of
A pair of kidney
A pair of ureters
A urinary bladder
A urethra
thoracic vertebra close to dorsal inner wall of the abdominal cavity.
Each kidney measures 10-12 cm in length, 5-7 cm in width, 2-3 cm in 
thickness.
Towards the centre of inner concave surface is a notch, called hilum
through which ureters, blood vessel and nerves enter into the kidney.
HUMAN EXCRETORY SYSTEM
Inner to hilum is a broad funnel shaped space
       called renal pelvis with projections called calyces.
The outer wall of kidney is a tough capsule.
Internally the kidney is differentiated into outer cortex and inner
medulla.
The medulla is divided into a few conical masses called medullary
pyramids.
Pyramids projected into the calyces.
The cortex extended in-between the medullary pyramids as renal
columns called columns of Bertini.