Exam III - Senses
The following is a list of structures in the eye through which light passes. Which one of the following answers best describes the order in which light passes through or hits each structure?
3. cornea 4. aqueous humor 2. pupil 1. lens 5. retina
Whereas the sense of taste is based on ________ (how many?) classes of taste receptors, the sense of smell has over ________ (how many?) different receptors for chemicals associated with odor.
5, 1,000
A stronger stimulus results in which one of the following?
Activation of more receptors and initiation of more action potentials
The loudness (intensity) of a sound is specifically associated with the?
Amplitude of the sound waves
Vibration of the ________ bends hairs of the hair cells, which ultimately generate impulses in ________.
Basilar membrane, hair cells
Which one of the following conditions results when the transparency of the lens decreases?
Cataracts
Which one of the following types of receptors are most likely to be classified as "silent" receptors?
Chemoreceptors
LASIK treatment functions to improve eyesight by?
Completely removing a defective cornea
Color blindness usually results from a decrease in the number of?
Cones
Each of the following statements about cones is TRUE, EXCEPT which one?
Cones are evenly distributed throughout the retina, accounting for visual acuity.
The malleus and incus function to?
Convert a sound wave into an electrical impulse
The transparent covering of the front of the eye is the?
Cornea
In the United States, more than 500,000 accidents and 6,000 deaths are linked to car crashes involving?
Distracted drivers
The vestibule contains two fluid-filled chambers, called the utricle and saccule, which are alike in that
Each has a gel-like substance on the inside
LASIK surgery involves reshaping the lens to correct for vision problems such as nearsightedness, farsightedness, and astigmatism.
False
The vestibular apparatus located in the middle ear is a system of fluid-filled chambers that is essential to the sense of hearing.
False
During eye examinations, a test is done to monitor the pressure within the eye. This test is done to detect?
Glaucoma
Different pitched (high or low) sounds are discriminated by the?
Hair cells in specific regions of the cochlea
Nearsightedness and farsightedness are caused by the ?
Length of the eyeball
A student noticed that when he closed his eyes, he could still determine the position of his arms and legs. This is largely due to the activity of
Mechanoreceptors
Mechanoreceptors specifically designed to monitor muscle length are termed?
Muscle spindles
Which of the following receptors are MOST likely to demonstrate receptor adaptation?
Olfactory receptors in the nose
The "blind spot" is associated with which one of the following?
Optic disk
Sound is amplified by components of the middle ear when they vibrate. When one of these components, the stapes, vibrates, the ________ will vibrate.
Oval window
Somatic receptors distributed throughout the body are linked to sensory neurons that send impulses to which one of the following regions of the brain?
Parietal lobe
When a sound wave first arrives at the ear, the wave is directed toward the auditory canal by?
Pinna
Some sensory receptors stop sending action potentials even though the original stimulus persists. This is known as which one of the following?
Receptor adaptation
Slow pain originating from an internal organ is often perceived as coming from an area of the body totally unrelated to the source. This is known as?
Referred pain
The vitreous humor fills the main chamber of the eye. Which one of the following structures of the eye would vitreous humor come in contact with?
Retina
Which one of the following parts of the eye is affected by cataracts?
Retina
Which one of the following structures is used to sense rotational movement of the head and body?
Semicircular canals
An individual never developed otoliths in the inner ear due to a genetic defect. Which one of the following will be impaired as a result?
Sense of head position
________ extend from the tip of taste cells in taste buds into the mouth.
Taste hairs
-Which one of the following occurs when bright light hits the eye?
The pupil decreases in size.
Receptors for fast pain?
Transmit action potentials to the brain along the same neurons used by spinal neurons
Both eyes have a blind spot, an area where there are no photoreceptors. When an image is focused on the blind spot, it cannot be "seen."
True
Pressure in the middle ear is equalized with the external air pressure through the auditory tube.
True
Taste hairs contain chemoreceptors that are specific for specific chemicals or tastants.
True
Olfactory receptors are located in which one of the following?
Upper part of nasal passages