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Exam 2 - Biology 252 Exam 2 DeSaix June 4 2009 Name Print...

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Biology 252 -- Exam 2 -- DeSaix June 4, 2009 Name________________________ Print your name, last name first, legibly on your answer sheet. Fill in Bubbles for your name and PID. Each answer is worth 2 points. Always choose the one best answer and use only number 2 pencils to fill in your answers. Be sure to sign the pledge on your answer sheet. The last question will be used only if another question has to be deleted. Turn in your scantron. Keep your test paper with answers. 1) Ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid are called ________. 1) A) ependymal cells B) Schwann cells C) oligodendrocytes D) astrocytes Answer: A 2) An action potential ________. 2) 3) An inhibitory postsynaptic potential (IPSP) is associated with ________. 3) 4) All of the following are true of graded potentials except that they ________. 4) 5) A second nerve impulse cannot be generated until ________. 5) A) the membrane potential has been reestablished B) the Na ions have been pumped back into the cell C) proteins have been resynthesized D) all sodium gates are closed Answer: A 1
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6) In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? The interior is ________. 6) 7) An excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle is ________. 7) 8) The period after an initial stimulus when a neuron is not sensitive to another stimulus is the ________. 8)
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