EBME201_Exam3Key_2006

EBME201_Exam3Key_2006 - EBME201 Exam 3 2006 Name_ Email_...

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EBME201 Exam 3 2006 Name__________________________________ Email__________________________________ Closed book; Closed notes; No Calculators allowed! Note: a word bank is provided but not all answers can be found in the work bank
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1) List the 6 primary senses and what kind of stimulus energy they transduce (common names are okay) Visual Light (electromagnetic) Auditory Sound Waves (mechanical) Vestibular Gravity (mechanical) Somatosensory Touch, Thermal, etc (mechanical, chemical) Gustatory Taste (chemical) Olfactory Scents (chemical) 2) A person holding a 200 gm weight can only detect the addition of more weight if the additional weight is at least 5 gms or more. How much weight would you have to add in order for the person to detect a change if he is only holding a 100gm weight? (show your work if you want credit) 200 5 1 1 = = S S K and grams S K S 5 . 2 2 5 100 200 5 2 2 = = × = × = 3) What is/are the mechanisms for rapid adaptation of receptors? A) The steady state component of a stimulus is filtered out due to the mechanical structure of the receptor B) An increase in stimulus intensity leads to positive feedback signaling C) prolonged depolarization of the membrane causes an inactivation of the cell’s spiking mechanisms D) a and c A) b and c 4) The effect of a sensory stimulus is to change the _____________across the membrane of the sensory receptor : a) conductance b) capacitance c) potential d) action potential firing g) All of the above
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5) Which most correctly describes a ‘receptive field’ for the skin? A) the group of all neurons that are activated by touching a specific spot on the skin B) the range of a sensory stimuli that can be perceived by the skin (itch, temperature, pain, etc) C) the area on the skin that will activate a specific sensory neuron when a stimulus is applied D) the density of sensory neurons in a given location E) None of the above 6) What information is conveyed by rapidly adapting receptors? a) the magnitude of the stimulus b) the rate of change of the stimulus c) the average effect of the stimulus integrated over time d) none of the above 5) List three different sensory modalities that utilize 2 nd messenger systems (common names are okay): Gustatory, Vision, Olfactory 6) What causes the ‘blind spot’ in the visual field? Optic disk-This is where the optic nerve leaves the retina and there are no photoreceptors 7) Put only one check mark per row indicating the best answer for that row. rods cones both neither A single photon can evoke a detectable electrical response x Used in color vision x Responds to light slowly so that the effects of all the photons absorbed during a 100 ms interval are summed together x Concentrated in the fovea x Contains more light transducing molecules x xxxx xxxx Light transducing end of cell is oriented toward the lens of the eye to gather the most light x Highly convergent; many of these cells convey information to the same ganglion cell. x
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EBME201_Exam3Key_2006 - EBME201 Exam 3 2006 Name_ Email_...

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