UWL ESS 205 - Membrane Transport (2 pages)

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Membrane Transport

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Membrane Transport


Detailed description of the different ways of membrane transportation and those that need energy or don't.

Lecture number:
Lecture Note
University of Wisconsin-La Crosse
Ess 205 - Human Anatomy and Physiology for Exercise Science I

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ESS 205 Anatomy and Physiology Lecture 3 Outline of Last Lecture I Development of Cell Theory II Concepts of Cellular Structure III Cell Surface IV Membrane Transport V Cytoplasm Outline of Current Lecture VI Permeability of Plasma Membrane a Two classifications VII Passive Transport VIII Active Transport IX Carrier Mediated X Non Carrier Mediated Current Lecture 1 The plasma membrane is selectively permeable meaning it controls what goes in and out of the cell There are two intertwined classification systems The first is passive and active transport 2 Passive no energy down the concentration gradient Think of a river going DOWN stream 3 The other is active which requires energy and goes up the concentration gradient or UP the river Carrier and Non Carrier Mediated on the other hand indicate whether a certain kind of membrane transportation needs help Carrier mediated means that it helps carry solutes across Non carrier mediated means the opposite Whatever method of membrane transport needs no help a One of the ways it does this is through filtration which is passive meaning no energy and non carrier mediated meaning it does not need any help to complete its task Filtration specifically requires hydrostatic pressure An example of filtration would be capillaries These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute b Simple Diffusion is also passive and non mediated This is simply the flow of particles down its concentration gradient Meaning it travels FROM a high concentration to a LOW concentration i The temperature molecular weight steepness of concentration gradient membrane surface area and membrane permeability all play a part in diffusion rates and how fast they occur c Osmosis is passive and non mediated but ONLY deals with the diffusion of WATER through a selectively permeable membrane 4 Carrier mediated transport are proteins that carry solutes across the

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