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.   acids
B.   salts
C.   sugars and alcohols
D.   proteins
E.   alkaloids
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.   an action potential occurs in the olfactory nerve
B.   odorants (air-borne chemicals) bind to surface receptors on the olfactory hairs
C.   impulses travel to the olfactory bulb
D.   a receptor potential is generated
E.   impulses travel to the thalamus and then to the olfactory area of the cerebral cortex
Question #4
The curvature of a lens is inversely proportional to the amount of refraction.
A.   FALSE
B.   TRUE
Question #5
Which of the following is not true of image formation by the eye?
A.   the image will be upside down
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.   image will be at the intersection of the two light rays
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.   used for day vision
B.   low sensitivity to light
C.   most are found in the fovea centralis
D.   high visual acuity
E.   contains the pigment rhodopsin
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.   inhibition (hyperpolarization) of bipolar cells
B.   rod cells are inhibited (hyperpolarized)
C.   neurons of the optic nerve do not produce an action potential
D.   ganglion cells unable to produce an EPSP
E.   rod cell release inhibitory transmitters
Question #10
Although the opsins in cone cells differ, the photo chemistry is the same as for rods.
A.   FALSE
B.   TRUE
Question #11
What part of the visual system is involved the fusion of vision, depth perception and detection of contrast?
A.   medulla oblongata
B.   thalamus
C.   primary visual cortex
D.   hypothalamus
E.   visual association area
Question #12
Which of the following does not occur in rod cells in the light?
A.   light strikes rhodopsin causing c-GMP channels to close
B.   voltage-regulated calcium gates close
C.   Na+ diffuses in and the rod cell is depolarized
D.   rods stop releasing of inhibitory neurtransmitters
E.   voltage-regulated calcium gates close and rods stop releasing of inhibitory neurtransmitters

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