Biology, asked by Bauisvwu8w, 1 year ago

Archeonephros kidney

Explain

Answers

Answered by YadavShashi
1

Archeonephros kidney :  Archeonephros is the name given to the hypothetical primitive  kidney of  ancestral vertebrate.  It  is  also  called  as  holonephros  or  complete  kidney.  (It  extended  entire  length  of  coelom)  It tubules  are  segmentally arragned  and nephrostome is  present.  Glomerulus  is  external  (without capsule).  It duct  is  called  as  archeonephric  duct.  Eg.  Larva  of  myxine  and  some  apodan  amphibians. Modern vertebrates  exhibits  three  different  kinds  of  adult  kidney Pronephros, Mesonephros  and Metanephros.

Answered by Guru33333
0
On the other hand, the animals that maintain internal osmolarity, different from the surrounding medium in which they inhabit. Many aquatic invertebrates are strict or limited osmoregulators. Most vertebrates are strict osmoregulators, i.e. they maintain the composition of the body fluids within a narrow osmotic range. The notable exception, however, are the hagfish (Myxine sp., a marine cyclostome fish) and elasmobranch fish (sharks and rays). Osmoregulators must either eliminate excess water if they are in hypotonic medium or continuously take in water to compensate for water loss if they are in a hype
rtonic situation. Therefore, osmoregulators have to spent energy to move water in or out and maintain osmotic gradients by manipulating solute concentrations in their body fluids.
Similar questions