Biology 3601A/B Lecture Notes - Lecture 5: Electrochemical Gradient, Active Transport, Blood Plasma
21 Oct 2016
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Lecture 5 ion and water balance 3: fishes in fresh and salt water. Stuff in water moves along gradients: diffusion and osmosis. Solutes move from high concentration to a low concentration to even out the concentration (equilibrium) Hyperosmotic: concentration is higher inside the fish than outside water flows in (i. e. fw fish) Hyposmotic: concentration is lower inside the fish than outside water flows out (i. e. sw/marine fish) Ion regulation in fishes occurs mainly at the gill epithelium. Mitochondria-rich (=chloride) cells abundant in these cells. Most of the balance of ions happens at the gill epithelium. Basolateral or serosal side is on the side of the blood. Apical or mucosal side is on the side of the water. If you have a lot of mitochondria you have a very active cell mitochondria produces atp from substrates, this cell/tissue must use a lot of energy then. Water is going to come in, salts (na+ & cl-) are going to leave.
