SampleMidtermExam (1)

SampleMidtermExam (1) - CBNS/PSYCH 120 Name_ Midterm I...

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CBNS/PSYCH 120 Name____________________________ Midterm I (Total of 100 pts) Part I. Multiple choice. 25 questions (2 points each, 50 pts). Choose the BEST answer. 1. The Na + /K + pump: a) is electrogenic b) moves sodium into the cell c) is responsible for the hyperpolarizing phase of the action potential d) all of the above e) a) and c) only 2. The falling phase of the action potential is caused by: a) activation of sodium channels b) closing of potassium channels c) inactivation of sodium channels d) inactivation of potassium channels e) activation of chloride channels 3. Myelination of motor axons is provided by: a) astrocytes b) oligodendrocytes c) schwann cells d) all of the above e) b) and c) only 4. Rectification occurs when: a) the membrane returns to E m following an action potential b) current flows in one direction only c) membrane capacitance is discharged d) current flows through a resistor in both directions e) all of the above 5. During the absolute refractory period: a) an action potential cannot occur b) an action potential can result from an elevated stimulus intensity c) the action potential amplitude is reduced d) threshold is reduced e) b) and c) 6. Conduction velocity increases with: a) increasing membrane resistance b) increasing membrane capacitance c) decreasing internal resistance d) a) and b)
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Name____________________________ e) a) and c) 7. The cell membrane: a) acts as a resistor to current flow b) breaks down during an action potential c) stores charge d) all of the above e) a) and c) only 8. Tetrodotoxin: a) blocks K channels b) inhibits Na channel inactivation c) opens K channels d) blocks Na channels e) blocks the Na/K ATPase 9. Threshold is reached when: a) the potential of the cell becomes sufficiently positive b) Inward Na + current and outward K
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This note was uploaded on 01/31/2011 for the course CBNS 120 taught by Professor Adams during the Winter '10 term at UC Riverside.

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SampleMidtermExam (1) - CBNS/PSYCH 120 Name_ Midterm I...

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