Urogenital System Flashcards
1
Q
What’s the purpose of the excretory system and what organs are involved?
A
- remove nitrogenous wastes and harmful substances
- controls osmosis to maintain water/salt balance
- kidney, gills, skin, digestive system, salt glands
2
Q
What’s the purpose of the reproductive system and what organs are involved?
A
- produce and release gametes, bring together
- provide nourishment to young
- gonads, ducts, cloaca, copulatory organs
3
Q
T or F: kidney development moves from posterior to anterior
A
False
development moves anterior to posterior in sequence
4
Q
What are the three sections of the kidneys, from anterior to posterior?
A
Pronephros, mesonephros, metanephros (meso and meta make up opisthonephros)
5
Q
T or F: more anterior regions degernerate as posterior regions become functional.
A
True
6
Q
What are some features of the pronephros?
A
- segmented in first 4 sections
- seen in all vertebrates but degenerates quickly
- functional in fish larvae, hagfish, teleosts
7
Q
Which vertebrates have an opisthonephric kidney?
A
- adult fish
- amphibians
- amniotes develop a mesonephros that degenerates
8
Q
What are some features of the metanephros?
A
- unsegmented
- forms posterior part of nephrogenic cord
- replaces mesanephros
- drained by ureter when functional kidney within amniotes
9
Q
What are the two sources of gonads?
A
- mesomere genital ridges
- primordial germ cells arising from endoderm that migrate to genital ridge
