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Unformatted text preview: Roll over each of the buttons to see a summary of each phase. mafianflfiw MIMI dam-nu and-am mum-nu ‘ g 535,--- g ‘~‘ a—qm '\‘\\ \‘ {—05 """""""""""" A...“ \ ‘\ anvil—mue- \ W \ m l l l “III-It) W CE-IVONTS I . .mmnwwhmmum mammalian. Q WWW-“mammal..— ”W . mmmuW-‘Ithhy G0 to the lien screen: We will come back and talk about graded potentials again. For now just recognize that graded potentials are small changes in membrane potential that occur when ion channels open or close in response to a stimulus acting of the cell. Graded potentials can be excitatory or inhibitory. The primary significance of graded potentials is that they determine whether a cell will generate an action potential. Only graded potentials that depolarize a neuron to the threshold level will cause an action potential. {El " 'mmmmmw'mm 8 lulu-cit Bull-at _ . W "" a W“- Go to the next screen. 'Graded potentials mm can sum together to ehcrt an action __'___ (9'76 "J1 5 potential. They can be temporal (stimuli are gr- “ fimwmm‘““"“'””"”“”“ applied in rapid succession by one :1“ " flammmhmmhymmhm stimulus) or spatial (stimuli from several W n”: different sources occur close together in H.” I)TmmlumMen-Iflmulnwmrwld , ""‘ min-.mmdmmwunmmmdoe tune and sum)_ nu antipa- baton the unwed-d m occurs b) mm - MOM Mwm M ”men melon mutt-r In tin- nnd urn [E] mwhnmhnudflhhnmdqh an: Click the Home Menu Button Click the Refractory Periods Button: During and immediately after an action potential. the membrane is less excitable than it is at rest. This period of reduced excitability is called the refractory period. There are two phases to the refractory period: absolute and relative. Roll over the Absolute Refractory Period Button: Spans all the depolarization phase — secorxi potential cannot be generated in response to a mom stimulus. Inactivation Na+ voltage gates are closed. Roll over the Relative Refractory Period Button: Occurs immediately after the absolute refractory period. It is possible to generate a second action potential, but a stronger stimulus is needed. Click the Home Menu Button ...
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