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EXCRETION (EXCRETORY ORGANS (organisms without excretory organs…
EXCRETION
EXCRETION is the removal of metabolic wastes from body
excretion is to maintain a constant internal environment, which is the HOMEOSTASIS
EXCRETORY ORGANS
organisms without excretory organs
Coelenterates (i.e. Ctenophora & Cnidaria)
echinoderm (e.g. starfish, sea urchins, etc.)
types of excretory organs
Epithelial excretory surfaces
Tubular excretory organs
EXCRETORY PRODUCTS
excretion of nitrogenous wastes
ureotelic
e.g. mammals, some bony fishes, certain amphibians, sharks
excretes urea as their main waste product
LUNGS - converting ammonia to urea
water and salts are excreted from body by kidneys as urine
excrete nitrogen waste as urea
uricotelic
excretion of nitrogenous waste as uric acid
removal of sweat via sweat gland inside skin and removal of carbon dioxide via lung
ammonotelic
e.g. aquatic invertebrates and bony fish
excretes ammonia as their main waste product
EXCRETORY SYSTEM
excretory system in animals
insects and terrestrial athropods
reabsorption of salts in hindgut
chloride cells in some insects
Malpighian tubules are present
metanephridia (eg. earthworm)
open-ended metanephridia in earthworm
NaCl is reabsorbed by active transport processes
protonephridia (eg. flatworms)
flame-bulb system in flatworm
Have cilia which causes the filtrate to flow down the tubule
as the filtrate flow ,some of the water and solutes are reabsorbed
vertebrates(filtration-reabsoprtion principle)
fish
kidneys in marine fish -Excrete Mg and SO4
saltwater fish
absorb Cl-
marine fish
Extrude Cl-
amphibians
Live near freshwater
eliminate large quantity of urine
Mangrove frog
can live in salt water
carries high urea in their blood
reptiles
freshwater reptiles
marine reptiles
Dry land reptiles
mammals and birds
Excretory system is tied with circulatory system
the processes
reabsorption
secretion
filtration
excretion
NOT similar to defecation