BIO 1140 Lecture Notes - Lecture 6: G Protein, Membrane Potential, Facilitated Diffusion
16 Oct 2016
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Excretes urea and not the common ammonia. Not expected to cross membrane easily, uses urea transporter. Concentration gradient between the fish and the surroundings. Every time the fish excretes urea there is a significant fall in the blood/urea. Is there a urea transporter for the toadfish yes. By adding urea into the water we are able to determine that the toadfish"s excretion is reversible through the diffusion of urea back into the fish through the transport mechanism levels. A facilitated diffusion mechanism using a transport protein with a passive movement with a direction decided by the direction of the diffusion gradient. Based on saturation kinetics and inhibited aspects we can determine the protein transport is active. We determined it is a facilitated diffusion due to its reversible diffusible nature. Cell membranes contain receptors allowing the cell to respond to outside. Water soluble signals cannot get through the membrane, interacting with.
