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Nerve Impulses.
Member rating: No Rating | Words: | Submitted: Tue Oct 21 2003
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Access - Biological Science Fri a.m. Cathy Hogg March 2003 Nerve Impulses 1. a) Polarised membrane The membrane of a resting neurone must always be polarised. This means that the fluid on the inside must be negatively charged with respect to the outside therefore, an electrical potential difference exists across it. 1. b) Resting potential The difference in the charge of the membranes inner and outer fluid is about -70mv (millivolts) i.e. the inside of the cell is negative relative to the outside. When the cell is not transmitting an impulse, the transmembrane potential is called the resting potential. 2. The resting potential of a neurone is maintained by the neurone being able to maintain an internal fluid composition different to that outside the cell. There are more charged proteins and potassium ions (K+) inside the axon than outside and more sodium ions (Na+), chloride ions (Cl-) outside the axon than inside. This imbalance produces an electrical gradient that...
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