2-1 Osmoregulation answers - SI Leader Anita Vijapura...

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SI Leader: Anita Vijapura Spring 2010 BSC2011 1/28/10-1/29/10 Osmoregulation Osmoregulation is the regulation of ______________ and ________________ concentrations. Diffusion vs. Osmosis: Hypertonic vs. Hypotonic: Isotonic: The invertebrates and non-vertebrates chordates are ___________ to sea water and ___________ to fresh water. So what happens? 1) osmotic gain of water 2) diffusional loss of NaCl So what do they do? 1) decrease blood [NaCl] 2) active extraction of NaCl 3) increase urine flow/ decrease [urine] Now going back to sea water, they are _________________. So what happens? 1) osmotic outflow of water 2) diffusional gain of NaCl So what do they do? increase blood [NaCl] Bony fish : Tonicity? hypo 1) drink sea water 2) decrease urine flow 3) active secretion of NaCl Sharks: Tonicity? Hyper w/ urea added to blood too 1) osmotic gain of water (no ingestion), but still less salt 2) diffusional gain of NaCl 3) use rectal gland to excrete excess NaCl 1
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SI Leader: Anita Vijapura Spring 2010 BSC2011 1/28/10-1/29/10 Mammalian Kidney The function unit is ______________.
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