osmoregulation by gills Flashcards
1
Q
what are a1b and a1a used for ?
A
enzyme subunits used to pump ions out of fish
2
Q
when moving from fresh to salt water, why is a1b used (uses less energy)? refer change in concentration gradient between the fish’s internals vs salt/fresh water
A
salt water is closer to fish’s internal salinity. less energy needed to pump ions out
3
Q
do gills excrete nitrogenous waste?
A
YES
4
Q
what is the function of trimethylamine oxide in sharks?
A
to counteract urea
5
Q
how do sharks supply themselves with protein (urea) after no food for ages?
A
rhesus protein pumps urea back into system
6
Q
can NaCl act as an acidity regulator?
A
YES it absorbs H+
