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Unformatted text preview: BIO 308: Human Physiology Practice Examination 2 2007 March 3 The following are multiple choice questions on the material that will be covered in Exam 2. These questions have been taken from last semester’s examinations and practice examinations in BIO 308. Choose the best answer or completion. 1. Opioid peptides act to reduce pain intensity by A. desensitizing (inhibiting) nociceptive sensory endings B. causing chemical breakdown of noxious substances C. blocking action potential transmission on A-delta and C-fiber axons D. reducing synaptic excitability at spinal cord synapses in the pain pathway E. depressing the activity of regions of the primary sensory cortex associated with pain sensation 2. Substance P is released from A. nociceptive afferent endings B. first order nociceptive terminals in the dorsal horn of the spinal cord C. mechanoreceptors in muscle spindles D. terminals of descending fibers from the brainstem of the midbrain E. both A and B above 3. The physiological basis of the distinction between sharp (pricking) pain and dull (aching, burning) pain is A. site of stimulation, with visceral and deep organs giving rise to dull pain and superficial organs giving rise to sharp pain B. intensity of stimulation, with low intensity stimulation causing sharp pain and high intensity stimulation causing dull pain C. type of ending stimulated, with A-delta fibers mediating sharp pain and C-fibers mediating dull pain D. type of stimulus, with hypoxia causing sharp pain and inflammation mediators causing dull pain E. none of the above, since the submodalities of pain are a cultural phenomenon and have no physiological basis BIO 308: Practice Exam 2 2007 Mar 3 page 2 4. The pain of a heart attack is sometimes sensed as originating in the left arm because A. stimulation of cardiac nociceptors causes reflex activation of left arm nociceptors B. the autonomic nerve fibers controlling coronary blood flow also control left arm blood flow C. stimulation of nociceptors in the left arm reduces coronary blood D. nociceptors in the heart and nociceptors in the left arm share the same dorsal root E. heart attacks are often accompanies by spasms of the left arm 5. Which of the following is an opioid peptide? A. substance P B. endorphin C. epinephrine D. capsaisin E. aspirin 6. Hypotension (reduced systemic arterial blood pressure) and sweating are characteristic responses to pain mediated by A. large myelinated fibers B. small myelinated fibers C. unmyelinated fibers D. all of the above E. none of the above 7. What is the function of the inner and outer hair cells of the cochlea? A. inner hair cells respond to soft sounds and outer hair cells respond to loud sounds B. inner hair cells respond to high pitched sounds and outer hair cells respond to low pitched sounds C. inner hair cells respond to simple tones (sine waves) and outer hair cells respond to complex sound patterns D. inner hair cells respond selectively to human speech and outer hair cells respond to music...
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This note was uploaded on 01/03/2012 for the course BIO 308 taught by Professor Acbrown during the Spring '10 term at Portland.
- Spring '10