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9 Membran potential

9 Membran potential - Biology141(Physiology 1:01 AM...

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4/6/08 1:01 AM Biology141 (Physiology) Page 1 of 4 https://courses.bio.psu.edu/spring2008/biol141/Lecture%209(2008).htm Biology141 (Physiology) Lecture 9 M. Whim MEMBRANE POTENTIAL. [1]. BACKGROUND. a few terms…. What is voltage ? What is current ? What are cations ? What are anions ? [2]. THE MEMBRANE POTENTIAL. (a). Every cell in the body has a membrane potential. it varies between different cells and cell types, but is in the range -50 to -90 mV. this means that there are more negatively charged particles on the inside of the cell than on the outside. why is the membrane potential important? 1. 2. (b). How does the membrane potential arise? a cell contains molecules that are negatively charged, e.g.? some negative ions (anions) are fixed in the cell (they can not cross the cell membrane). the anions attract positive charges (cations) into the cell. The cations are small inorganic ions
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4/6/08 1:01 AM Biology141 (Physiology) Page 2 of 4 https://courses.bio.psu.edu/spring2008/biol141/Lecture%209(2008).htm that are small enough to get through pores in the membrane. The cations are mainly K+, Na+ and Ca2+.
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