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Osmoregulation
an overview of osmoregulation
41
Biology
Undergraduate 1
05/03/2011

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Term
nephridia
Definition
osmoregulatory organ of earthworms
Term
malpighian tubules
Definition
osmoregulatory organ of insects
Term
example of osmoconformers
Definition
marine invertebrates
Term
secretion
Definition
moves solutes and water out of blood into urine
Term
nephron
Definition
functional unit of kidney
Term
making urine
Definition
filtration, reabsorption, secretion
Term
hypo-osmotic
Definition
freshwater fish environment
Term
hyper-osmotic
Definition
marine fish environment
Term
freshwater fish must
Definition
get rid of water & retain salt
Term
marine fish must
Definition
get rid of salt & retain water
Term
freshwater fish
Definition
gills absorb solute & lots of filtering and urine
Term
marine fish
Definition
gills excrete solute & little filtering and urine
Term
loop of henle
Definition
in mammals and birds & allows for highly concentrated urine
Term
where ammonia comes from
Definition
amino acids and nucleic acids
Term
fish excrete
Definition
ammonia
Term
amphibians and mammals excrete
Definition
urea
Term
reptiles, birds, and insects excrete
Definition
uric acid
Term
long loops
Definition
in juxtamedullary nephron
Term
short loops
Definition
in corticol nephron
Term
afferent arteriole
Definition
blood enters glomerulus
Term
efferent arteriole
Definition
blood exits glomerulus
Term
glomerular podocytes
Definition
produce filtration sites/pores
Term
primary urine
Definition
produced by filtration
Term
final urine
Definition
made from reabsorption modifying primary urine
Term
cells and proteins
Definition
not filtered by nephron
Term
ions, amino acids, glucose, and water
Definition
filtered by nephron
Term
bowman's capsule
Definition
where filtrate goes after nephron
Term
proximal tubule
Definition
where most of reabsorption occurs
Term
reabsorption
Definition
most water and solutes (glucose, amino acids) from filtration are returned to the blood
Term
secretion
Definition
additional elimination of waste products
Term
H+ secretion
Definition
aids in pH balance of blood
Term
K+ secretion
Definition
helps balance K concentration
Term
reabsorption process
Definition
active transport of sodium*, followed by chloride RA, then water RA by osmosis. *glucose and amino acids co-transport with sodium
Term
countercurrent flow
Definition
flow of urine in opposite directions
Term
interstitial fluid
Definition
fluid outside nephron
Term
ADH
Definition
causes water reabsorption by collecting duct
Term
kidney osmolarity
Definition
"saltiest" inside
Term
aquaporins
Definition
allow water reabsorption by collecting duct
Term
aldosterone stimulus
Definition
low blood pressure
Term
aldosterone (Na)
Definition
increased reabsoption of water and Na across distal convoluted tubule
Term
aldosterone (K)
Definition
increase secretion in tubule for excretion
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