Please enable JavaScript.
Coggle requires JavaScript to display documents.
Excretory organ : : (Example (Reptiles (Freshwater reptiles-excrete dilute…
Excretory organ : :
Example
-
Vertebrate kidneys
kidney function on filtration-reabsorption
principle to produce urine
-
-
Amphibians
-When in water, there is influx of water which eliminate by producing large quantities of urine
-frog's kidney, urea is eliminated by glomerular filtration
Mangrove frog (abe to live in salt water)
-urea loss is minimized via combination of very lowrate of urine flow & cessation of urea secretion
-
-
Process
Reabsorption
substances that are important to the body (eg: Na, glucose & amino acid) must be reabsorbed from the tubular fluid and returned to the blood by loop of Henle
-
Filtration
-Blood flows through the glomerular capillaries and move the dissolves low molecular weigh substance into the Bowman's capsule
-sieve-like endothelium hold back the blood cells, the basement membrane stops large protein molecules and filtration slits hold back smaller protein molecules
Excretion
Toxic substances (eg: urea, uric acid & other) are eliminated
excretory product
Ureotelic produces urea
(mammals, most amphibians, sharks, some bony fishes
Uricotelic produces Uric acid
(many reptiles, including birds, insects and land snails
Ammonotellic produces Ammonia through gill
(most aquatic animals, including most bony fishes)
with excretory organ
Epithelial excretory surfaces
(eg:Chloride cells of fish, salt pumps of brine shrimp)
tubular excretory organ
(eg. Nephrons in kidneys of vertebrates, malpighian tubules in insect, flame cells in the planarians or flatworms, nephridia in earthworms, etc)
-
without excretory organ
i) Coelenterates (ie: Ctenophora & Cnidaria)
ii) echinoderm (eg: starfish, sea urchins etc)
-excretion through plasma membrane / cell membrane into body cavity and then to the environment