BIOLOGY 225 Lecture 34: Lecture 12/5 - Osmoregulation 2
Document Summary
Gain water and salt ions from food/drinking seawater. Excretion of salt ions from gills and urination. Uptake of water and some ions in food. Excretions of large amts of water in urine. Osmotic water gain through gills and other body parts. Can control water ion balance with epithelial cells. Mitochondria rich cells, generate lots of energy. Diffuse across cells (leaky, not tight junctions) Use one channel to flow into cell and another to flow out. Nk2c (makes sure electrical gradient doesn"t change) Acidify environment by pumping h out, make na come in. Has cl bicarbonate coexchanger and other similar pumps, but on basal lateral side of cell. Don"t need to remember ammonia/uric acid pathways, but need to remember advantages and disadvantages. Vertebrate kidneys have six roles in homeostasis. Excretion of metabolic wastes and toxins ph balance. If your kidney isn"t working you have to do dialysis, but it can introduce infection.
