Plant transportation notes - Lecture 25 Plant transport(36...

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Lecture 25: Plant transport (36) Transpiration The loss of water from the leaves, created the force that pull sap up; results in evaporative cooling , which can lower the temperature of a leaf and prevent denaturation of various enzymes involved in photosynthesis and other metabolic processes Passive transport The diffusion of a substance across a biological membrane. Active transport The movement of a substance across a biological membrane against its concentration or electrochemical gradient with the help of energy input and specific transport proteins. Proton pumps create a hydrogen ion gradient that is a form of potential energy that can be harnessed to do work; use ATP Membrane potential The charge difference between a cell’s cytoplasm and the extracellular fluid, due to the differential distribution of ions (H + ). Membrane potential affects the activity of excitable cells and the transmembrane movement of all charged substances.
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