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Chapter 49 Questions-1 - Ch 49 Multiple Choice Identify the...

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Ch 49 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Which of the following is a sensation and not a perception? a. seeing the colors in a rainbow b. a nerve impulse induced by sugar stimulating sweet receptors on the tongue c. the smell of natural gas escaping from an open burner on a gas stove d. the unique taste of french fries with cheese e. the sound of a fire-truck siren as it passes by your car ____ 2. An interoreceptor would detect which of the following stimuli? ____ 3. Why are we able to differentiate tastes and smells? a. The action potentials initiated by taste receptors are transmitted to a separate region of the brain than those initiated by receptors for smell. b. The sensory region of the cerebral cortex distinguishes something we taste from something we smell by the difference in the action potential. c. The brain distinguishes between taste, arising from interoreceptors, from smell arising from exteroreceptors. d. Because we are able to see what we are tasting, the brain uses this information to distinguish taste from smell. e. Taste receptors are able to detect fewer molecules of the stimulus, which means these receptors will initiate a receptor potential before smell receptors do. ____ 4. Sensory receptors have all of the following functions in common except a. increased permeability to sodium and potassium ions. b. conversion of stimulus energy to membrane potential. c. strengthening of stimulus energy sent to the nervous system. d. processing information through graded potentials. e. conduction of impulses to the central nervous system. ____ 5. If a stimulus is to be perceived by the nervous system, which part of the sensory pathway must occur first ? ____ 6. What is the correct sequence of events that would lead to a person hearing a sound? 1. transmission 2. transduction 3. integration 4. amplification
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____ 7. Immediately after putting on a shirt, your skin feels itchy. However, the itching stops after a few minutes and you are unaware that you are wearing a shirt. Why? a. Sensory adaptation has occurred. b. Accommodation has increased. c. Transduction has increased. d. Motor unit recruitment has decreased. e. Receptor amplification has decreased. ____
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