PSL300 Special Senses Mastering A&P Questions With
Complete Solutions
__________ light from objects reaching our retinas is perceived.
Reflected
Emitted, reflected, and refracted
Emitted
Refracted
Emitted and reflected
Absorbed Correct Answers Emitted, reflected, and refracted
EXPLANATION:
Emitted, reflected, and refracted light reaching our retinas is
perceived. Light penetrates the pupil of the eye and hits the back
of the retina, where it is absorbed by the pigments of the
photoreceptors, rods and cones. Reflected light from objects and
refraction by structures of the eye are important in stimulating
receptors in the retina.
Emitted light is going to enter into the eye through the pupil to
activate the photoreceptors. This is not the only correct answer.
Reflection is a phenomenon in which light waves strike and
bounce off a surface. Reflection is important in vision because
,much of the light we perceive has reflected off the objects we
are observing. This is not the only correct answer.
Refraction refers to the bending of light waves as they pass
through materials of different optical densities. Refraction
occurs because the speed of light is different in varying media.
Light passing into the eye is refracted as it passes through the
cornea and lens. This is not the only correct answer.
If light is absorbed by an object, it is not able to stimulate the
photoreceptors and therefore that light will not be perceived.
A high-pitched sound is also a high-__________ sound.
duration
frequency
decibel
amplitude Correct Answers high frequency
EXPLANATION:
A high-pitched sound is also a high-frequency sound. The
frequency of sound waves is the number of waves that enter into
the ear per a unit time. Frequency differences are perceived by
hair cells in different locations of the cochlear duct.
Changes observed in amplitude occur when a stimulus changes
in intensity.
, Duration is a measure of how long the stimulus is applied as
opposed to the speed at which it travels.
The decibel is a measure of loudness, which is then linked to a
perception of intensity.
Activation of the parasympathetic nervous system produces
__________.
flattening of the lens
hyperopia
pupil dilation
accommodation Correct Answers accommodation
EXPLANATION:
Activation of the parasympathetic nervous system produces
accommodation. Accommodation is under control of the
parasympathetic nervous system, which triggers contraction of
the ciliary muscle for near vision. In the absence of
parasympathetic activity, the ciliary muscle relaxes.
Pupil dilation occurs when the dilator muscle around the pupil
contracts and is under the control of the sympathetic nervous
system.
Hyperopia is a condition of the lens of the eye that will result in
an inability to focus well on objects. In hyperopia, the lens or
cornea is too weak for the length of the eyeball. Therefore, the
Complete Solutions
__________ light from objects reaching our retinas is perceived.
Reflected
Emitted, reflected, and refracted
Emitted
Refracted
Emitted and reflected
Absorbed Correct Answers Emitted, reflected, and refracted
EXPLANATION:
Emitted, reflected, and refracted light reaching our retinas is
perceived. Light penetrates the pupil of the eye and hits the back
of the retina, where it is absorbed by the pigments of the
photoreceptors, rods and cones. Reflected light from objects and
refraction by structures of the eye are important in stimulating
receptors in the retina.
Emitted light is going to enter into the eye through the pupil to
activate the photoreceptors. This is not the only correct answer.
Reflection is a phenomenon in which light waves strike and
bounce off a surface. Reflection is important in vision because
,much of the light we perceive has reflected off the objects we
are observing. This is not the only correct answer.
Refraction refers to the bending of light waves as they pass
through materials of different optical densities. Refraction
occurs because the speed of light is different in varying media.
Light passing into the eye is refracted as it passes through the
cornea and lens. This is not the only correct answer.
If light is absorbed by an object, it is not able to stimulate the
photoreceptors and therefore that light will not be perceived.
A high-pitched sound is also a high-__________ sound.
duration
frequency
decibel
amplitude Correct Answers high frequency
EXPLANATION:
A high-pitched sound is also a high-frequency sound. The
frequency of sound waves is the number of waves that enter into
the ear per a unit time. Frequency differences are perceived by
hair cells in different locations of the cochlear duct.
Changes observed in amplitude occur when a stimulus changes
in intensity.
, Duration is a measure of how long the stimulus is applied as
opposed to the speed at which it travels.
The decibel is a measure of loudness, which is then linked to a
perception of intensity.
Activation of the parasympathetic nervous system produces
__________.
flattening of the lens
hyperopia
pupil dilation
accommodation Correct Answers accommodation
EXPLANATION:
Activation of the parasympathetic nervous system produces
accommodation. Accommodation is under control of the
parasympathetic nervous system, which triggers contraction of
the ciliary muscle for near vision. In the absence of
parasympathetic activity, the ciliary muscle relaxes.
Pupil dilation occurs when the dilator muscle around the pupil
contracts and is under the control of the sympathetic nervous
system.
Hyperopia is a condition of the lens of the eye that will result in
an inability to focus well on objects. In hyperopia, the lens or
cornea is too weak for the length of the eyeball. Therefore, the
