Exam2 416K-Fall 06

Exam2 416K-Fall 06 - Name Bio416K Physiology and Functional...

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Name ___________________________ Bio416K Physiology and Functional Anatomy Lecture Exam 2 Endocrine and Neurophysiology Fall 06 1. When the membrane of an axon terminal depolarizes, ______________________. a. Ca 2+ ions enter the axon terminal b. exocytosis is initiated c. neurotransmitters are released into the synaptic cleft d. a and c e. a , b and c 2. The effect that a neurotransmitter has on the postsynaptic membrane of a neuron depends on _______________________. a. the quantity of neurotransmitter released b. the ion specificity of channels involved in the postsynaptic potential c. the number (density) of neurotransmitter receptors present on the postsynaptic membrane d. the specific type of neurotransmitter released e. all of the above 3. A mother brings her child into your emergency clinic showing signs of partial muscle paralysis on the left side of the body and sporadic loss of consciousness. The child’s mother also reports that that the child fell out of a tree the day before and bumped her head. You suspect that the child is hemorrhaging intracranially. From the choices below, where is the most likely place for the blood to be accumulating? a. between the skull and dura mater b. between the dura mater and pia mater c. between the pia mater and brain tissue d. in the ventricles of the brain e. in the choroid plexus 4. Which brain region is considered to be the integrating center for homeostasis? a. hypothalamus b. thalamus c. medulla oblongata d. cerebral cortex e. basal nuclei 5. Secondary hypothyroidism would be most likely caused by ____________________. a. inadequate (below normal) levels of TSH production an the pituitary level b. excessive (above normal) levels of TRH production at the hypothalamus c. excessive levels of T4 thyroid hormone produced by a thyroid gland tumor d. below normal levels of T4 thyroid hormone due to autoimmune destruction of the thyroid gland 1
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e. all of the above 6. The following are the main steps in the generation of an action potential. Put the steps found below into the correct sequence in which they occur . 1. all of the sodium channel gates regain their resting state configuration 2. voltage-gated potassium channels open and potassium moves out of the cell 3. sodium channel inactivation gates close 4. a graded depolarization brings an area of an excitable membrane to threshold 5. a temporary hyperpolarization occurs 6. voltage-gated sodium channel activation gates open 7. sodium ions enter the cell and depolarization occurs a. 4, 6, 7, 3, 2, 5, 1 b. 4, 6, 7, 1, 2, 5, 3 c. 6, 7, 4, 1, 2, 3, 5 d. 2, 4, 6, 7, 1, 3, 5 e. 4, 2, 5, 6, 7, 3, 1 7. In studying a group of cells it is discovered that when stimulated by a particular hormone there is a marked increase in the activity of a G-coupled protein receptor (GPCR) in the cell membrane. The hormone being studied is most likely ___________________.
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This note was uploaded on 03/19/2008 for the course BIO 416K taught by Professor Findell during the Fall '08 term at University of Texas.

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Exam2 416K-Fall 06 - Name Bio416K Physiology and Functional...

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