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ProblemSetWk3ans - Bio D103: Cell Biology Winter 08: Week 2...

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Bio D103: Cell Biology Bio. Department Tutoring Winter 08: Week 2 Lectures 4-6 Review 1/23/08 Wed. 1-3:00 SH157 In one week, you finished covering action potentials, briefly covered mitochondria and introduced treadmilling! These are very important concepts (with lots of potential midterm questions) so we will cover AP and the mitos this week and actin and treadmilling next week. Action potentials 1.) What ions are responsible for making creating the membrane potential? What proteins are responsible for propagating an action potential? NA+/K+ are small, charged molecules that are segregated to the cytoplasmic and cytosolic side of the neuron. This separation creates a difference in charge between the outside and inside of the cell creating a potential for electric signals to be sent. Here is the sequence for an action potential: stimulus . Ligand-gated Na+ ch. open - slight depolarization (less negative) Voltage-gated Na+ ch. open - Na+ rush into the neuron: depolarization. Voltage-gated Na+ ch. become inactivated
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This note was uploaded on 05/28/2008 for the course BIO SCI D103 taught by Professor Suetterlin/macgregor during the Winter '08 term at UC Irvine.

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ProblemSetWk3ans - Bio D103: Cell Biology Winter 08: Week 2...

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