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1 | | There is no difference in action potentials produced in sensory receptors. |
| | A) | True |
| | B) | False |
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2 | | Not all chemoreceptors are exteroreceptors. |
| | A) | True |
| | B) | False |
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3 | | Nerve endings specialized for detecting painful stimuli are known as nocioceptors. |
| | A) | True |
| | B) | False |
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4 | | Phasic receptors react only at the onset of a stimulus, and quickly stop reacting even if the stimulus continues. |
| | A) | True |
| | B) | False |
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5 | | Nerve impulses from a touch receptor will be interpreted as touch whether the receptor is being stimulated by touch, pressure, vibration, or any other stimulus. |
| | A) | True |
| | B) | False |
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6 | | Generator (receptor) potentials are graded potentials that are proportional to the duration and intensity of a stimulus. |
| | A) | True |
| | B) | False |
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7 | | The phasic response of a pacinian corpuscle is due to the nature of the connective tissue wrapping around the nerve fiber, not to properties of the fiber itself. |
| | A) | True |
| | B) | False |
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8 | | Afferent, somatesthetic nerve fibers from proprioceptors and pressure receptors synapse in the spinal cord prior to reaching the brain. |
| | A) | True |
| | B) | False |
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9 | | Since it is important to react quickly to heat, cold, or pain, the afferent nerve fibers for these receptors are large and myelinated. |
| | A) | True |
| | B) | False |
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10 | | The afferent (sensory) nerve fibers that originate in the thalamus synapse on the soma of cells in the postcentral gyrus. |
| | A) | True |
| | B) | False |
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11 | | Large areas of the postcentral gyrus are devoted to sensory information from large areas of the body (such as the chest or back), and smaller areas to information from smaller parts of the body (such as the fingers). |
| | A) | True |
| | B) | False |
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12 | | Neurons that have the smallest receptive fields are found in the areas of the skin that is most sensitive. |
| | A) | True |
| | B) | False |
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13 | | Two points of contact will be felt as one unless they fall within the receptive fields of different neurons. |
| | A) | True |
| | B) | False |
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14 | | The sense of taste requires molecules dissolved in saliva to bind to the sensory neurons of the taste buds. |
| | A) | True |
| | B) | False |
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15 | | Molecules that are pervieved as being bitter stimulate G-coupled receptors known as gustducins. |
| | A) | True |
| | B) | False |
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16 | | Most acids molecules taste sweet. |
| | A) | True |
| | B) | False |
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17 | | Although the sense of taste is not well understood, it appears that those molecules that do have a taste act by stimulating the production of cAMP as a second messenger. |
| | A) | True |
| | B) | False |
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18 | | Olfactory stimuli like other senses that they do have nerve tracts that synapse in the thalamus en route to interpretation. |
| | A) | True |
| | B) | False |
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19 | | Odors cannot be classified into a small number of modalities like the four primary tissues. |
| | A) | True |
| | B) | False |
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20 | | The vertical acceleration produced by riding in an elevator is detected by receptors in the saccule. |
| | A) | True |
| | B) | False |
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21 | | Specialized sensory receptors like photoreceptors are secrete neurotransmitters. |
| | A) | True |
| | B) | False |
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22 | | Calcium carbonate crystals serve to increase the inertia of cupula within the semicircular canals. |
| | A) | True |
| | B) | False |
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23 | | Hair cells of the semicircular canals are stimulated by the inertia of the endolymph in the semicircular canals. |
| | A) | True |
| | B) | False |
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24 | | The pitch of a sound is a function of its decibels. |
| | A) | True |
| | B) | False |
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25 | | A sound of zero decibels cannot be heard and is considered infrasonic. |
| | A) | True |
| | B) | False |
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26 | | A sound of 10 dB is 50 times as loud, and a sound of 50 dB is 500 times as loud, as the threshold of hearing which is at 0 dB. |
| | A) | True |
| | B) | False |
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27 | | Sound waves are channeled by the pinna into and along the auditory tube to the tympanic membrane. |
| | A) | True |
| | B) | False |
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28 | | The tensor tympani muscle helps to dampen the vibrations of the auditory ossciles when an extremely loud sound is being detected. |
| | A) | True |
| | B) | False |
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29 | | The stapedius muscle helps to amplify vibrations of the eardrum as they are transferred to the oval window. |
| | A) | True |
| | B) | False |
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30 | | Contraction of the tensor tympani allow the auditory tube to open so pressure can be equalized between the middle and outer ear. |
| | A) | True |
| | B) | False |
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31 | | The scala vestibuli and scala tympani are filled with endolymph. |
| | A) | True |
| | B) | False |
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32 | | Compression of the endolymph allows the mechanical activity of the auditory ossicles to transfer the energy in the sound waves transmitted to the tympanic membrane. |
| | A) | True |
| | B) | False |
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33 | | The more the stereocilia of cochlear hair cells are bent, the louder a sound is perceived. |
| | A) | True |
| | B) | False |
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34 | | Sounds of higher frequency cause more stereocilia to bend than do sounds of lower frequency. |
| | A) | True |
| | B) | False |
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35 | | Sounds of different pitch stimulate different regions of the auditory cortex. |
| | A) | True |
| | B) | False |
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36 | | The sense of hearing declines with age faster in men than in women. |
| | A) | True |
| | B) | False |
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37 | | Conduction deafness is due to failure of the hair cells to generate action potentials, or failure of the action potentials to be conducted to the auditory cortex. |
| | A) | True |
| | B) | False |
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38 | | The human retina is not sensitive to ultraviolet light. |
| | A) | True |
| | B) | False |
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39 | | Electromagnetic radiation of long wavelengths has less energy than radiation with shorter wavelengths. |
| | A) | True |
| | B) | False |
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40 | | The posterior chamber of the eye is occupied by the vitreous body. |
| | A) | True |
| | B) | False |
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41 | | Brown and black eye colors are due to the pigment melanin in the iris and blue eye color is due to the pigment anthocyanin in the iris. |
| | A) | True |
| | B) | False |
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42 | | Zonular fibers attach the lens to the ciliary body of the eye, forming a suspensory ligament that supports the lens. |
| | A) | True |
| | B) | False |
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43 | | Vision depends primarily on the refraction of light rays by the cornea. |
| | A) | True |
| | B) | False |
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44 | | The right half of the visual field projects onto the retina of the right eye, and the left half of the visual field projects onto the retina of the left eye. |
| | A) | True |
| | B) | False |
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45 | | As an object is brought closer to the eye, the curvature of the lens must increase to keep it focused on the retina. |
| | A) | True |
| | B) | False |
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46 | | The ciliary body (muscle) puts the least tension on the lens when its muscle is relaxed. |
| | A) | True |
| | B) | False |
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47 | | Presbyopia results from the thickening of the lenses of the eyes due to aging. |
| | A) | True |
| | B) | False |
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48 | | Hyperopia is due to eyeballs that are too short for the focal length of the lens. |
| | A) | True |
| | B) | False |
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49 | | Within the retina, the optic disc is the area of greatest visual acuity. |
| | A) | True |
| | B) | False |
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50 | | Visual purple gets its name from the fact that it absorbs best in the violet to blue part of the color spectrum. |
| | A) | True |
| | B) | False |
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51 | | Rod and cone photoreceptor cells produce graded potentials but not action potentials. |
| | A) | True |
| | B) | False |
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52 | | The ability to see in the dark is primarily a function of the rods. |
| | A) | True |
| | B) | False |
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53 | | Color blindness is caused by a gene on the X chromosome, and since women have two X chromosomes, they are more likely than men to be color blind. |
| | A) | True |
| | B) | False |
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54 | | A person who genetically lacks red cones is known as a monochromat and will see everything in shades of green. |
| | A) | True |
| | B) | False |
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55 | | The blue, green, and red cones absorb different wavelengths of light because they have different opsins. |
| | A) | True |
| | B) | False |
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56 | | The eyes have the greatest number of cones and the sharpest visual acuity at the optic disc. |
| | A) | True |
| | B) | False |
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57 | | The least neuronal convergence and greatest visual acuity occurs within the retina at the fovea centralis. |
| | A) | True |
| | B) | False |
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58 | | The areas of the retina with the most neuronal convergence are most responsive in dim light. |
| | A) | True |
| | B) | False |
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59 | | All the impulses from the left eye are transmitted to the right visual cortex, and all the impulses from the right eye are transmitted to the left visual cortex. |
| | A) | True |
| | B) | False |
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60 | | In response to the photodissociation reaction sodium ion channels in photoreceptors close. |
| | A) | True |
| | B) | False |
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61 | | The lateral geniculate nucleus has separate layers of neurons for input from the right and left eyes. |
| | A) | True |
| | B) | False |
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62 | | Eye movements are regulated by nerve fibers from the lateral geniculate nucleus. |
| | A) | True |
| | B) | False |
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63 | | Resonses of on-center and off-center receptive fields are complementary to each other. |
| | A) | True |
| | B) | False |
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