Physiology V01 - Introduction to Human Physiology » Fall 2021 » Lecture Quiz 7

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Question #1
What type of chemicals cause a sour sensation?
A.   sugars and alcohols
B.   salts
C.   acids
D.   alkaloids
E.   proteins
Question #2
Chemicals react with taste “hairs” (microvilli) causing a receptor potential in the taste cells which results in an action potential in cranial nerves VII, IX, and X.
A.   FALSE
B.   TRUE
Question #3
Which step of olfactory transduction is not correct?
A.   a receptor potential is generated
B.   impulses travel to the thalamus and then to the olfactory area of the cerebral cortex
C.   odorants (air-borne chemicals) bind to surface receptors on the olfactory hairs
D.   an action potential occurs in the olfactory nerve
E.   impulses travel to the olfactory bulb
Question #4
The curvature of a lens is inversely proportional to the amount of refraction.
A.   TRUE
B.   FALSE
Question #5
Which of the following is not true of image formation by the eye?
A.   image will be at the intersection of the two light rays
B.   light rays traveling through the curved portions of the lens are not refracted and light rays traveling through the center of the lens are refracted through the focal point
C.   the image will be upside down
Question #6
To focus for far vision the ciliary muscles contract which reduces the tension on the suspensory ligaments and the lens.
A.   FALSE
B.   TRUE
Question #7
Which of the following is true of rods?
A.   low sensitivity to light
B.   high visual acuity
C.   most are found in the fovea centralis
D.   contains the pigment rhodopsin
E.   used for day vision
Question #8
Each type of cone cell can absorb only one wavelength of light.
A.   FALSE
B.   TRUE
Question #9
Which of the following does not occur in the dark?
A.   neurons of the optic nerve do not produce an action potential
B.   ganglion cells unable to produce an EPSP
C.   inhibition (hyperpolarization) of bipolar cells
D.   rod cell release inhibitory transmitters
E.   rod cells are inhibited (hyperpolarized)
Question #10
Although the opsins in cone cells differ, the photo chemistry is the same as for rods.
A.   TRUE
B.   FALSE
Question #11
What part of the visual system is involved the fusion of vision, depth perception and detection of contrast?
A.   primary visual cortex
B.   thalamus
C.   visual association area
D.   hypothalamus
E.   medulla oblongata
Question #12
Which of the following does not occur in rod cells in the light?
A.   Na+ diffuses in and the rod cell is depolarized
B.   voltage-regulated calcium gates close and rods stop releasing of inhibitory neurtransmitters
C.   voltage-regulated calcium gates close
D.   rods stop releasing of inhibitory neurtransmitters
E.   light strikes rhodopsin causing c-GMP channels to close

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