PHGY 209 Lecture Notes - Lecture 18: Aquaporin, Homeostasis, Gas Constant
16 Sep 2016
School
Department
Course
Professor
Document Summary
The carrier involved is actually the enzyme atpase which can split atp on the cytoplasmic side of the membrane, and thus release the necessary energy: the carrier molecule binds na+ on the cytoplasmic surface of the membrane. This results in the activation of atpase and the consequent release of energy: through a change in configuration, the carrier delivers the. There exists other active transporter proteins: ca-atpase, h-atpase, h/k atpase. Active transport in which energy released during transmembrane movement of one substance from higher to lower concentration is transferred to the simultaneous movement of another substance from lower to higher concentration. Cotransport: na+ moves in the same direction as the solute (x) (sometimes called simport) Countertransport: a solute (x) transported in the opposite direction to na + (antiport) Secondary active transport mechanisms: na+/h, na+/ca2+ - keeps calcium levels low within cells. Active transport mechanisms (energy-dependent) involving participation of the cell membrane itself.
