Comparative anatomy of the exotic urinary system
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14 Terms
advantage of ammonia excretion
simplest - no energy required
what is the disadvantage of urea excretion
requires energy to convert to urea in the liver
how may molecules of N are excreted in urea and uric acid
urea - 2
uric acid - 4
why is uric acid semi-solid
it is insoluble - helpful for desert animals to conserve water
what do fish use the kidneys for
caudal end - excretory tissue
caudal and cranial - lymphoid and haematopoietic tissue
which exotics ahve a loop of henle
only birds
not present in fish
not present in reptiles
which species have a bladder
sea turtles
tuatara - green iguana
not snake
not bird
not fish
what is the kidney of the reptile used for
vitamin C synthesis and vitamin D conversion
where is the sea turtle kidney
caudal coelom
what is the caudal end of the kidney (DCT in snake) used for in lizards and snakes
in the mating season (male) it becomes tissue to produce seminal fluid
how do snakes conserve urine
urine reflux into the colon
2 arteries supplying the kidneys
cranial division - external iliac artery from aorta
middle and caudal divisions - branches of the ischiatic arteries
venous supply to the kidneys
external iliac
internal iliac
ischiatic
caudal mesenteric veins
cranial and caudal portal veins from the external iliac and common iliac make a ring on the ventral side
where does blood drain via from the caudal body
external iliac vein