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Unformatted text preview: NPB 101 Fall 2001 Midterm I October 22,2001 1. The membrane potential of a cell at rest... a. can best be described as a potassium diffusion potential. b. is established primarily by a complex series of oxidation-reduction reactions. c. is oriented such that the outside of the cell is negative relative to the inside. d. is usually about gOmV in magnitude. e. a and d. 2. Consider a situation in which the normal amount of Ca++ within the Sarcoplasmic Reticulum of a typical skeletal myofiber is reduced to zero. This would probably cause an inability of the fiber to contract as a result of normal stimulation. a. True b. False 3. A gymnast falls off the uneven bars, strikes her head and is knocked unconscious. After a week of rest, she returns to her normal routine and performs her moves perfectly. She remains articulate in her speech, with every word clearly enunciated and perfectly understandable. However, when asked to describe her routine on the uneven bars, she says "...apple calendar moon card automobile computer classroom brain." It is likely that her fall caused damage to... a. the post parietal cortex. b. Wernicke's area. c. Broca's area. d. the premotor area. e. the postcentral gyrus. 4. Which of the following is true with respect to the sensory system? a. The fact that severely nearsighted people live an essentially normal life is evidence that an intact sensory system is not necessary for survival of the organism. b. The brain becomes aware that the intensity of a stimulus has increased because the amplitude of the action potentials reaching it along an established pathway are larger. c. Increasing stimulus intensity will result in an increased frequency of spikes fired in a sensory receptor. d. All specialized sensory receptor devices communicate with their sensory neurons by means of chemical neurotransmission. e. None of the above. 1 NPB 101- Fall 2001 Midterm I 5. The basic contractile unit of skeletal muscle is… a. the Motor End Plate. b. the Transverse Tubule. c. the Sarcomere. d. the Motor Neuron. e. none of the above. 6. The surface of the tongue has many taste buds containing chemoreceptor cells. In the cell that mediates the 'sweet' sensation, sugar molecule interact with molecular receptors on the membrane. That causes potassium conductance to decrease and the cell depolarizes. This is an example of... a. the extreme sensitivity of sensory receptors. b. the fact that sensory receptors function as amplifiers. c. transduction in a sensory receptor. d. adaptation. e. None of the above. 7. The maximum rate at which a neuron can fire action potentials is limited by... a. the length of the neuron. b. the duration of the absolute refractory period....
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- e. b