Spring 2007 Neurophysiology Section Exam (PGY 300)

Spring 2007 Neurophysiology Section Exam (PGY 300) - Spring...

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Spring 2007 Neurophysiology Section Exam 1. What is not characteristic of graded potentials? a) often originates in dendrites of neurons b) can be depolarizing or hyperpolarizing c) declines in amplitude as it travels along a neuron d) has a fixed voltage * e) does not have a threshold for activation 2. What effect does hypokalemia have on action potentials in a neuron? a) no effect b) lowers the threshold needed to produce an action potential c) decreases the amplitude of the action potential d) increases the frequency of action potentials e) increases the stimulus strength needed to produce an action potential* 3. What property of the transmembrane S4 segment of the sodium channel permits it to function as a voltage sensor? a) presence of a ligand binding site b) presence of ion pore c) presence of charged amino acids* d) presence of lipid tail e) presence of mechanical gating 4. What channel modification produces habituation in Aplysia? a) Increase in calcium channel current b) Increase in potassium channel current c) Increase in sodium channel current d) Decrease in potassium channel current e) Decrease in calcium channel current* 5. Detection of high and low frequency sounds (pitch) depends upon: a) number of hair cells in the cochlea b) which end of the basalar membrane vibrates most* c) the decibel value of sound d) activation of metabotropic receptors e) length of the cochlear nerve
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6. The sequence of events in chemical synaptic transmission is: a) calcium channel activation, action potential conduction, synaptic vesicle fusion,
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Spring 2007 Neurophysiology Section Exam (PGY 300) - Spring...

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