Systems Phys exam 1-fall 2003 key

Systems Phys exam 1-fall 2003 key - 1 SYSTEMS PHYSIOLOGY...

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1 SYSTEMS PHYSIOLOGY Fall, 2003 Dr. Sid Auerbach FIRST EXAMINATION 2 OCTOBER 2003 NAME:_____________________________ Student ID No.___________________
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1. Homeostasis: A. depends on the interaction of receptors, integrating centers and effectors. B. depends on control systems that use primarily positive feedback. C. always involves an increase in a regulated physiological variable back towards its set-point. D. A & B E. all of the above 2. Each of the following involves NEGATIVE feedback EXCEPT: A. Sodium influx during the first, depolarization phase of an action potential B. Shivering and an increase in heat production in response to a cold environment C. Thirst and increased fluid intake in response to an increase in blood osmolarity D. Sweating and loss of body heat in response to a warm environment 3. Primary auditory cortex is located in the _______________lobe of cortex: A. occipital B. frontal C. temporal D. parietal 4. The primary function of the basilar membrane in the cochlea is______________: A. decomposing complex acoustical waveforms into simpler waveforms B. amplifiying low intensity sound waves C. providing information about the location of an auditory stimulus D. providing information about the loudness of an auditory stimulus 5. Which of the following statements best describes the role of the efferent pathway in a homeostatic control system? A. Direct detection of changes in the internal or external environment B. Conduction of information into a central processing area C. Conduction of information out of a central processing area to effector organs D. None of the above 6. The frequency of a sound wave provides information about: A. location B. loudness C. pitch D. all of the above 7. Which of the following mediates direct flux of ions from one cell to another? A. Metabotropic receptors B. Vesicle exocytosis C. Gap junctions D. Ligand-gated receptors
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3 8. The ________ class of chemical messengers is distributed to target cells via the blood and the ________ class of chemical messengers is released into extracellular fluid to act locally on target cells. A. neurotransmitter neurohormone B. neurohormone paracrine agent C. neurohormone hormone D. neurotransmitter autocrine agent E. paracrine agent autocrine agent 9. How does diffusion of an ion through a membrane differ from diffusion of a small lipophilic molecule? A. only diffusion of the ion requires selective membrane channels B. only diffusion of the ion is influenced by a membrane potential C. only diffusion of the ion can establish an electrochemical gradient D. all of the above 10. A chemical messenger that acts back on the same cell that released it is called a(n): A. paracrine agent B. hormone C. neurohormone D. autocrine agent 11. Which of the following may cause opening or closing of membrane ion channels? A.
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Systems Phys exam 1-fall 2003 key - 1 SYSTEMS PHYSIOLOGY...

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