NPB101-Usrey-Debello-Final

NPB101-Usrey-Debello-Final - Final Exam NPB 101 , Winter...

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Unformatted text preview: Final Exam NPB 101 , Winter 2003 Identify the letter of the choice that best completes the statement or answers the question. 1) 2) 3) 4) 5) The plasma membrane 3. appears under an electron microscope as a double dark line with a light space between. is composed primarily of a double layer of phospholipid molecules with proteins interspersed throughout the phospholipids in a mosaic pattern. separates the intracellular and extracellular fluid. contains cholesterol. All of these answers. b. c. d. e. Facilitated diffusion a. involves a carrier molecule. (9. requires energy expenditure. c. is how glucose enters the cells. (1.. Both (a) and (c) above. e. All of these answers. The sodium-potassium pump moves potassium ions it moves into the cell. sodium ions out of the cell for every 2 .3-_3 b. 5 c. 7 d. 11 e. 13 The fallin g phase of the action potential is due to a. calcium equilibrium. __l_3,., potassium efflux. c. potassium influx. (1. sodium efflux. e. sodium influx. Because of the presence of both activation and inactivation gates. voltage- gated Na+ channels can a. be closed but capable of opening. b. activated. c. closed and not capable of opening. _c_l._ All of these answers. e. None of these answers. .‘ a. b. ,c... d. e. 7) a. b. If a neuron were experimentally stimulated at both ends simultaneously. the action potentials would pass in the middle and travel to the opposite ends. the action potentials would meet in the middle and then be propagated back to their starting positions. the action potentials would stop as they met in the middle. the strongest action potential would override the weaker action potential. summation would occur when the action potentials met in the middle, resulting in a larger action potential. In divergence, thousands of synapses from many presynaptic neurons end upon a single postsynaptic cell. the dendrites diverge from the cell body to contact as many presynaptic neurons as possible. the action potential initiated in the axon diminishes as it diverges into the axon terminals. the axon of a nerve cell branches to synapse with many other cells so that activity in one neuron influences the excitability of many other cells. 8) Which component of the nervous system is comprised of sympathetic and parasympathetic divisions? PF—PP‘?’ central nervous system. somatic nervous system. autonomic nervous system. afferent division. None of these answers. 9) With presynaptic inhibition . [09”?! d. e. an IPSP occurs at the postsynaptic cell body. all excitatory information being fed into the cell is depressed. the release of excitatory transmitter from a specific presynaptic excitatory input is depressed. Both (a) and (b) above. None of these answers. 10) Phineas Gage‘s prefrontal association cortex was damaged during a railroad accident. This brain region normally P—PP‘E" plays an important role in personality traits. integrates somatic, auditory, and visual sensations. compares actual with intended movements. localizes the source of sensory input and perceives the level of intensity of the stimulus. is responsible for speech comprehension. In the visual pathway, the I a. fibers from the medial halves of both retinas cross at the optic chias t b. optic nerve carries information from the lateral half of one retina and the medial half of the other retina. g; optic nerve carries information from both the lateral half and the medial half of the retina of the same eye. d. Both (a) and (b) above. e. Both (a) and (c) above. 12) The ossicular system of the car a. serves to keep the pressure on the two sides of the tympanic membrane equal. 1;. increases the pressure of vibration as it transfers the sound wave from air in the outer ear to fluid in the inner ear. . assists in determining whether a sound comes from the front or rear. 0 d. is part of the vestibular apparatus. e. is in direct contact with the tympanic membrane and the round window. 13) A deficiency of the neurotransmitter dopamine in the basal nuclei causes schizophrenia. Parkinson‘s disease. epilepsy. depression. aphasia. was?!» 14) Which of the following is a monosynaptic reflex? stretch reflex withdrawal reflex brain stem reflexes Both stretch reflex and withdrawal reflex. All of these answers. Pia-99"!” 15) Which of the following changes in banding pattern occur during muscle contraction? a. the A band gets shorter. __b. the I band gets shorter. c. the H zone gets shorter. @ both the I band and the H zone get shorter. c. All of these answers. 16) The sarcoplasmic reticulum stores ‘96—! when a muscle is relaxed and releases it for binding to during contraction. a. calcium, troponin b. calcium, tropomyosin c. sodium, tropomyosin d. potassium, tropomyosin e sodium, troponin \H - ) The plateau of the cardiac action potential (in contractile cells) results from the opening of voltage-gated channels in the plasma membrane of the cardiac cell. sodium. potassium. calcium. . chloride. glucose. 3 5-7 on??? 18) Under normal conditions, the function of the atrioventricular node is to excite the left and right atrium. control the heart rate. prevent the atria and ventricles from contracting simultaneously. . repolarize the heart after systole. None of these answers. 3" D-ln 53‘?“ 19) During the isovolumetric phase of ventricular systole: a. the ventricles are contracting isometrically. g, the atrioventricular valves and semilunar valves are closed. 0. blood is ejected into the great vessels. d. the ventricles are relaxing. e. Both (a) and (b) above. 20) The energy for cross bridge cycling during muscle contraction is provided by acetylcholine. Ca2+. ATP. myosin. actin. 90-9?!» 21) A motor unit refers to a single motor neuron plus all of the muscle fibers it innervates. a single muscle fiber plus all of the motor neurons that innervate it. all of the motor neurons supplying a single muscle. a pair of antagonistic muscles. a sheet of smooth muscle cells connected by gap junctions. 5" 9-9 P‘lP 22) Select the vessel carrying blood with a comparatively high concentration of oxygen. a. chordae tendineae. b. inferior vena cava. c. pulmonary artery. __d, pulmonary vein. e. superior vena cava. 3) The parasympathetic nervous system has little effect on activity. . heart rate. d. SA node. .43. ventricular. 24) The volume of blood ejected from each ventricle during a contraction is called the a. end-diastolic volume. b. end-systolic volume. 3. stroke volume. d. cardiac output. e. cardiac reserve. 25) If the connection between the SA node and AV node becomes blocked. a. the ventricles will beat faster. 1;. the ventricles will heat more slowly. c. the ventricular rate of contraction will not be affected. d. the stroke volume will increase. e. tachycardia will occur. 26) Hemoglobin a. plays a critical role in determining the total amount of 02 that is exchanged because it acts as a storage depot, removing dissolved 02 and thus keeping the P02 low so that net diffusion is allowed to continue. b. combines only with 02. c. is found in erythrocytes. d. Both (a) and (c) above. 3. All of these answers. 27) Which of the following is the last step that produces an inspiration? (f. the atmospheric pressure becomes lower than the intrapleual pressure. ,15. the diaphragm contracts. 2: the intercostal muscles contract. 5|. the intra-alveolar pressure becomes lower than the atmospheric pressure. e. the intrapleural pressure becomes positive. 28) Systemic venous P02 is £52 alveolar P02. and systemic venous PC02 is Mal veolar PC02. a. ' reater than, greater than. b. greater than, less than. ._c.. less than. greater than. d. less than, less than. c. equal to, equal to. Below is a listing of nephron components and associated structures: descending limb of loop of Henle Bowman's capsule collecting tubule ascending limb of loop of Henle distal tubule proximal tubule PVPP’PE" Indicate the correct flow of filtrate through these structures: 4, 6, 5. 3, 2, l ) 9 t ‘9 9 9 .- v mam-[k Lana—p: a. a e c. 5 cl. 2 e. l OKLA-{km l 6 ,6 4 2 2 3 2! l I I 9 30) Aldosterone stimulates Na+ reabsorption in the distal and collecting tubules. is secreted by the JG apparatus. stimulates K+ secretion in the distal tubule. Both (a) and (b) above. .1. Both (a) and (c) above. 999‘?” 31) Angiotensin I a. is formed as a result of activation of angiotensinogen by renin. b. is transformed into angiotensin II as a result of converting enzyme action in the lungs. c. acts on the adrenal cortex to stimulate aldosterone secretion. 31, Both (a) and (b) above. e. All of these answers. 32) The ascending limb of the loop of Henle actively transports NaCl into the surrounding interstitial fluid. is impermeable to water. is found in the renal cortex. drains into the proximal convoluted tubule. Both (a) and (b) above. @931 53“!“ 33) The N a+-K+ ATPase transport system that plays a pivotal role in much of tubular reabsorption is located in the luminal membrane of tubular cells. basolateral membrane of tubular cells. podocytes. glomerular capillary membrane. basement membrane. peeve 4) Digestive secretions include a. enzymes. b. bile. c. mucus. d. hormones. e. all of these answers. 35) What prevents food from entering the nasal passages during swallowing? elevation of the uvula. contraction of the pharyngeal muscles. positioning of the tongue. . tight apposition of the vocal cords over the glottis. elevation of the epiglottis over the nasopharynx. snast 36) Stomach acid is neutralized in the duodenum. Is neutralized with bidcarbonate. Is neutralized by solutions secreted by the pancreas. Both (a) and (b) above. All of these answers. 9 9'??? 37) Which statement regarding control of pancreatic secretion is correct? a. gastrin stimulates release of neutralization solution. b. CCK stimulates release of enzymes. c. secretin stimulates release of bicarbonate. d. Both (a) and (b) above. 41.. Both (b) and (0) above. 38) The specificity of a hormone’s action is due to a. spatially restricted release of the hormone. b. the biosynthetic enzymes that produce it. c. specific binding of the hormone to plasma proteins. g. specific binding of the hormone to target-cell receptors. e. discrete inactivation of hormones by the liver or kidneys. 39) Lipophilic hormones a. include steroids and thyroid hormone. b. bind with receptors located inside their target cells. c. activate cell surface receptors on their target cells. «d. Both (a) and (b) above. e. All of these answers. -. a b. c. d. e. ) Which of the following situations represents negative feedback? when hormone A stimulates hormone B, hormone B inhibits hormone C. when hormone A inhibits hormone B, hormone B inhibits hormone A. when hormone A stimulates hormone B, hormone B inhibits hormone A. when hormone A inhibits hormone B, hormone B inhibits hormone C. when hormone A stimulates hormone B, hormone B stimulates hormone A. 41) The hypothalamo-hypophyseal portal system a. b. --_- C. d. C. carries vasopressin and oxytocin from the hypothalamus to the posterior pituitary for storage. carries hypophysiotropic hormones from the hypothalamus to the posterior pituitary to control the release of posterior pituitary hormones. carries hypophysiotropic hormones from the hypothalamus to the anterior pituitary to control the release of anterior pituitary hormones. was s in w. cl :7 carries vasopressin and oxytocin from the hypothalamus to the anterior pituitary to control the release of anterior pituitary hormones. Both (‘0) and (0) above. 42) Blood sugar levels a. b. c. :1. must remain within normal range because the brain needs a constant supply of sugar. Increase in response to glucagon secretion. Increases in response to gluconeogenic activity. Both (a) and (b) above. 6 All of these answers. 43) Which of the following is characteristic of the adrenogenital syndrome? a b. C. d. o. 44) A j. b. C. d. e. precocious pseudopuberty in prepubertal boys. development of male-type external genitalia in female fetuses. hirsutisrn in adult females. Both (a) and (c) above. All of these answers. goiter is an enlarged thyroid. always accompanies hypothyroidism. is present only with iodine-deficient diets. occurs only when TSH levels are elevated. Both (a) and (:1) above. 45) The erection reflex in males 7.3.. b a. (1. ® can be triggered by tactile stimulation of the glans penis. involves an increase in sympathetic tone. involves dilation of penile arterioles and compression of veins. may fail to produce an erection due to either physical or psychological factors. All of these answers. 6) Prior to fertilization a. sperm move through the oviduct towards the ovary. b. the acrosome reaction occurs. c. the morula is swept towards the uterus. Both (a) and (b) above. 6. All of these answers. 47) The number of primary oocytes in a female } is decreased continually throughout her reproductive life from puberty to menopause. _ b. is maintained constant during her reproductive life because those that are lost are continuously replaced by an equal number of new primary oocytes. c. increases at the time of menopause. (1. Both (a) and (c) above. e. Both (b) and (c) above. 48) During the follicular phase of the ovarian cycle, ‘ estrogen gradually rises and then peaks just prior to ovulation. progesterone levels reach their maximum concentration. the corpus luteum degenerates. the uterine lining is optimal for implantation. All of these answers. 99.0942» 49) Birth control pills act as contraceptives by a. preventing development of the endometrium into a suitable site for implantation. b. preventing ovulation by inhibiting GnRH and thus FSH and LH secretion. c. killing sperm. d. precipitating in the cervical canal to act as a barrier to sperm entry. e. increasing muscular contractions in the female reproductive tract so that ovulated eggs are flushed out before they have a chance to be fertilized. 50) Normal labor and delivery requires a. dilation and effacement (softening) of the cervix. b. dampening of the contractions of the uterine wall. c. a positive feedback cycle mediated by the hormone oxytocin. (1. Both (a) and (b) above. :3. Both (a) and (0) above 51) Would you like to have your scored scantron left outside Briggs 185b for you to pick up at your convenience? a) Yes. b) No, I would rather pick up my scantron in person. ' You have Test Form B. Please indicate this on your scantron in the box below your ID number. ...
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This note was uploaded on 04/05/2012 for the course NPB 101 taught by Professor Fuller,charles/goldberg,jack during the Spring '08 term at UC Davis.

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NPB101-Usrey-Debello-Final - Final Exam NPB 101 , Winter...

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