Study Guide Exam III Study Sheet 4

Study Guide Exam III Study Sheet 4 - 1. Review the major...

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1. Review the major ionic composition of the ECF and ICF. ECF ICF Na+ 250 K+ (Cation) Cl- 250 Phosphates (Anion) (PO4 or HOP4) Proteins (Anion) 2. What is a membrane potential? What factors contribute to the development of a membrane potential? Membrane Potential = Charge Causes of membrane potential: Unequal distribution of perm. Ions. (Na+, Cl-, K+) Unequal distribution of diffusion (Ca > K+ > Na+) Work of Na+/K+ pump 3. What is the magnitude of the membrane potential? What factors contribute to magnitude of the membrane potential at any given time? 4. Define an equilibrium potential. Which of the ionic equilibrium potentials are very close to the resting membrane potential? Close to the reverse potential? 5. Define an action potential. What is the mechanism by which action potential takes place. 6. Draw and label an action potential diagram and identify the following: a. Resting membrane potential b. Threshold c. Depolarization d. Repolarization e. Hyperpolarization (inhibited) f. Hypopolarization (facilitated) 7. Describe the all-or-none nature of the action potential.
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8. What is a graded potential and how does it differ form an action potential?
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Study Guide Exam III Study Sheet 4 - 1. Review the major...

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