Ion + Water Balance Flashcards
What can environment refer to in animal physiology?
the external world for the entire organism
the extracellular fluid for a cell
the cytoplasm for intracellular enzymes
What are the 3 homeostatic processes of body fluid regulation?
osmotic regulation
ionic regulation
nitrogenous waste excretion
What is osmotic regulation?
regulation of the osmotic pressure of body fluids
What is ionic regulation?
the regulation of specific ion concentrations in body fluids
What is nitrogenous waste excretion as a process of body fluid regulation?
the excretion of urea and uric acid (end products of protein metabolism) from the body
What are the major ions in salt and freshwater?
sodium
chloride
magnesium
sulfate
calcium
potassium
bicarbonate
Which major ions are most highly concentrated in seawater vs. freshwater?
seawater:
- Na
- Cl
- Mg
- Sulfate
fresh:
- bicarbonate
- Ca
- Na
How does the concentration of Na compare in seawater to freshwater?
seawater 470 mM > 0.35 mM fresh
sea > > fresh
How does the concentration of Cl compare in seawater to freshwater?
sea > > fresh
How does the concentration of bicarbonate compare in seawater to freshwater?
sea > fresh
sea = 2, fresh = 1.72
T or F: all of the major ions are concentrated more heavily in seawater than fres h
true
bicarbonate is the only one that comes close in freshwater to seawater concentrations
How does the osmolarity of seawater compare to that of freshwater?
seawater > > freshwater
sea ~1100 mOsm/L
fresh 0.5-10 mOsm/L
What is osmolarity?
the number of solute particles per 1L of solvent
How does the RATIO of concentration of major ions (Na, Cl, K) in the intracellular and extracellular fluid of squid axons compare to mammalian muscles?
squid axons have lower ratios of ions in/out than mammals
How does the osmolarity of major ions (Na, Cl, K) in the intracellular and extracellular fluid of squid axons compare to mammalian muscles?
squid axons have much higher osmolarity than mammalian muscles
What osmotic and ionic challenges do animals face in marine environments?
the environmental conditions (high osmolarity) make it easy to gain salts and easy to lose water
What osmotic and ionic challenges do animals face in freshwater environments?
the low osmolarity conditions make it easy to lose salts and easy to gain water
What osmotic and ionic challenges do animals face in terrestrial environments?
less water outside body than inside = easy to lose water
What is the osmoregulatory and ionoregulatory strategy of marine arthropods?
isosmotic
no ionoregulation
What is the osmoregulatory and ionoregulatory strategy of marine molluscs (ex. squid)?
slightly hyperosmotic
ionoregulation
What is the osmoregulatory and ionoregulatory strategy of marine fish, amphibians, reptiles, mammals, birds?
hyposmotic
ionoregulation
What is the osmoregulatory and ionoregulatory strategy of freshwater arthropods?
hyperosmotic
ionoregulate
What is the osmoregulatory and ionoregulatory strategy of freshwater molluscs (ex. clams)?
slightly hyperosmotic
ionoregulate
What is the osmoregulatory and ionoregulatory strategy of freshwater fish, amphibians, reptiles, mammals, birds?
hyperosmotic
ionoregulate