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Unformatted text preview: lecture 1 08/07/2008 15:15:00 Cellular physiology: a cell maintains an internal environment that is chemically distinct from the external environment. Barrier=plasma membrane I. Transport across membrane A. Passive transport: no energy used, relies on gradient o 1. Simple diffusion: hydrophobic/small 1. Steroids 2. O2 3. CO2 2.facilitated diffusion: Hydrophilic (small) Help of special protein: 3 types Pores: size restriction (porins) holes in membrane Channels: specific holes in membrane for a particular molecule Carriers: shape changes, no hole (in book permease) o Ions o Glucose (uses carrier) o Water B. 08/07/2008 15:15:00 08/07/2008 15:15:00 ...
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