Biology (Raven), 9th Edition

Chapter 45: Sensory Systems

Post-Test

1
A receptor potential:
A)is a depolarization of a sensory receptor.
B)increases in size with distance from its source.
C)always causes an action potential.
D)only occurs above a threshold value of the stimulus.
E)all of the above
2
What would be the consequence(s) of having a mutation that blocked the flow of sodium and calcium ions into transient receptor potential (TRP) ion channels?
A)Sensory neurons would not fire in response to high temperatures.
B)Sensory neurons would continually fire.
C)The individual would feel pain if subject to high temperatures.
D)The individual would be very sensitive to high temperatures.
E)None of these would occur
3
What would happen if you had an unusually short basilar membrane in the cochlea?
A)Your sense of balance would be affected.
B)You would not be able to detect very high frequency sounds.
C)You would not be able to detect very low frequency sounds.
D)All sounds would be muffled.
E)all of these are correct
4
Within a taste bud, the chemicals that produce salty and sour tastes:
A)act indirectly by binding to G protein-coupled receptors.
B)act directly on sensory neurons.
C)act directly through ion channels.
D)act directly by binding to G protein-coupled receptors.
E)none of these
5
In the vertebrate eye photoreceptor cells detect light. What condition(s) occur in the dark?
A)cGMP levels are high.
B)cGMP levels are low.
C)Rhodopsin activates a G protein that stimulates phosphodiesterase.
D)An influx of Ca+ ions is prevented.
E)Na+ channels are closed.
6
Homing pigeons have the ability to detect the Earth's magnetic field and use it for orientation when flying under overcast conditions. What would you predict if you fixed a small bar magnet on a pigeon's head and released it on a cloudy day?
A)It will fly off in the correct direction towards home.
B)It will fly off in exactly the opposite direction of home.
C)It will be unable to fly at all.
D)It will fly off in a random direction.
E)It's impossible to predict what will happen.
7
For all different types of sensory receptors, it is true that as the intensity of the stimulus increases the:
A)amplitude of the action potential increases.
B)frequency of the action potentials increase.
C)threshold level for the action potential decreases.
D)frequency of the action potentials decrease.
E)none of these
8
Which of the following is NOT a mechanoreceptor?
A)proprioceptor
B)thermoreceptor
C)nociceptor
D)baroreceptor
E)kinoreceptor
9
The detection of sound waves works better in air than in water.
A)True
B)False
10
Flies taste with their feet.
A)True
B)False
11
Which phyla have independently evolved well-developed, image-forming eyes?
A)platyhelminthes, arthropoda, mollusca, chordata
B)arthropoda, mollusca, echinodermata, chordata
C)annelida, arthropoda, mollusca, chordata
D)annelida, arthropoda, chordate
E)none of these is correct.
12
Some vertebrates can detect:
A)infrared radiation.
B)magnetic fields.
C)electric currents.
D)all of these
E)none of these
13
A proprioceptor detects
A)taste.
B)pain.
C)gravity.
D)color.
E)temperature.
14
The most sensitive vertebrate chemoreceptors known are the
A)organs of Corti of bats.
B)organs of Corti of humans.
C)rods and cones of mammals.
D)olfactory receptors of mammals.
E)taste receptors of fishes.
15
In humans, the receptor cells for hearing are located in the
A)tympanic membrane.
B)cochlea.
C)semicircular canals.
D)Eustachian tube.
E)oval window.
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