Key_-_Bio416k_Exam_2_Spring_06

Key_-_Bio416k_Exam_2_Spring_06 - Name _ KEY - Bio416K...

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Name ______________________________ KEY - Bio416K Physiology and Functional Anatomy 1 Lecture Exam #2 Endocrine and Neurophysiology 1. An excitatory postsynaptic potential (EPSP) ____________________. a. depolarizes a neuron, making it harder to initiate an action potential b. hyperpolarizes a neuron, making it harder to initiate an action potential c. depolarizes a neuron, making it easier to initiate an action potential d. hyperpolarizes a neuron, making it easier to initiate an action potential e. always causes an all-or-none action potential 2. Which of the following is not a possible drug (pharmacological) effect on synaptic function? a. interfere with neurotransmitter synthesis b. alter the rate of neurotransmitter release c. prevent neurotransmitter binding to receptors d. prevent neurotransmitter inactivation (degradation) e. change the type of neurotransmitter found in the synaptic vesicle 3. The actual cell site of integration in the nervous system is the ________________. a. chemical synapse b. electrical synapse c. trigger zone d. dendritic membrane e. axon terminal 4. When more action potentials (i.e., greater frequency) arrive at the axon terminal, how are neurotransmitters affected? a. more neurotransmitter molecules are released into the synapse. b. different molecules are released into the synapse. c. fewer molecules are released into the synapse. d. there is no effect – all signals are identical (all-or-none). e. neurotransmitter molecules are broken down slower 5. The speed (i.e., rate) of action potential conduction would be greatest in which of the following nerve axons? a. a myelinated axon 20 microns in diameter b. a nonmyelinated axon 20 microns in diameter c. a myelinated axon 2 microns in diameter d. a nonmyelinated axon 2 microns in diameter e. a nonmyelinated axon 25 cm long 1
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6. During the relative refractory period, an initial threshold-level depolarization is usually not sufficient to trigger an action potential. Why? a. only some Na + channels have returned to their resting position. b. K + channels are still open, so Na + entry is offset by K + loss c. Only a few K + channels have returned to their resting position d. The statement is incorrect: a threshold-level depolarization always triggers an action potential. e. A and B are correct f. A, B and C are correct 7. Parathyroid hormone (PTH) __________________________. a. increases bone formation and lowers blood calcium levels b. increases calcium excretion from the body c. decreases calcium absorption form the intestines d. demineralizes (i.e., dissolves) bone and raises blood calcium levels e. inhibits the formation of calcitriol f. two of the above a correct 8. Damage to large numbers of oligodendrocytes in the CNS would result in ____________________. a. decreased production of cerebrospinal fluid (CSF)
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This test prep was uploaded on 04/07/2008 for the course BIO 416K taught by Professor Findell during the Spring '08 term at University of Texas.

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Key_-_Bio416k_Exam_2_Spring_06 - Name _ KEY - Bio416K...

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