b. They would provide the same precision of sensory information. Receptor A has a circular receptive field with a diameter of 2.5 cm. Receptor B has a circular receptive field of 7.0 cm in diameter. Which receptor allows you to more precisely localize a stimulus? a. Receptor A b. They would provide the same precision of sensory information. c. Receptor B d. It would depend on the location of the receptors. Answer: a
Nociceptors are _______. They are sensitive to ______. a. thermoreceptors; extremes of temperature and changes in vibration b. pain receptors; extremes of temperature, mechanical damage, and chemicals released from injured cells c. pain receptors; changes in pressure or stretch in muscles d. chemoreceptors; changes in concentration of chemicals or compounds Answer: b
a. Tonic receptors are always active. Distinguishing facts concerning tonic receptors include all of the following EXCEPT: a. Tonic receptors are always active. b. The frequency of action potential generation indicates the background level of stimulation. c. Tonic receptors are active for a short time whenever a change occurs in conditions monitored. d. When a stimulus increases or decreases the rate of action potential generation changes. Answer: c
Which of the following is incorrect concerning chemoreceptors? a. They are located in the fourth ventricle of the brain and so we are not consciously aware of the sensations they provide. b. Chemoreceptive neurons are located in the carotid bodies and aortic bodies. c. Chemoreceptors monitor the levels of respiratory gases in blood and CSF. d. None of the above statements are incorrect. Answer: d
c. tactile (Merkel’s) disc d. lamellated (Pacinian) corpuscle Which type of tactile receptor gives you the most information about location size and shape of the source of stimulation? a. root hair plexus b. free nerve ending c. tactile (Merkel’s) disc d. lamellated (Pacinian) corpuscle Answer: c
a. mechanoreceptors: detect changes in temperature Which type of general sensory receptor is correctly paired with its function? a. mechanoreceptors: detect changes in temperature b. chemoreceptors: sensitive to stimuli that distort their cell membranes c. thermoreceptors: detect changes in concentration of specific chemicals or compounds d. none of the above Answer: d
Baroreceptors are located in ______ and detect changes in ______. a. blood vessels; respiratory gases b. respiratory tract; respiratory gases c. carotid bodies; pressure d. digestive tract; pH Answer: c
b. unmyelinated Type C fibers c. glutamate d. myelinated Type A fibers A patient who describes their pain as “prickling” is experiencing pain sensations carried by ______. a. substance P b. unmyelinated Type C fibers c. glutamate d. myelinated Type A fibers Answer: d
a. peripheral adaptation b. anosmia c. sensory coding Which of the following has occurred if you no longer notice the smell of a dirty cat litter box? a. peripheral adaptation b. anosmia c. sensory coding d. central adaptation Answer: d
Which spinal tract carries action potentials generated by nociceptors? a. fasciculus cuneatus b. fasciculus gracilis c. lateral spinothalamic tract d. anterior spinothalamic tract Answer: c