Why does the smell of formaldehyde seem to dissipate during the time you spend in the dissection

lab, yet you are able to detect the cologne of someone who just entered the lab?

1. Olfactory receptors are destroyed by formaldehyde. 2. Olfactory receptors adapt to the smell of

formaldehyde.3. Central adaptation has occurred, though olfactory

receptors retain sensitivity to other smells.4. None of these is correct.

What is unique about the sense of smell when compared to other special senses?

1. Olfaction travels along only one cranial nerve. 2. Olfaction is a chemical sense.3. Olfactory stimulation passes through two synapses

in the thalamus.4. Olfactory stimulation is the only type of sensory

information that reaches the cerebral cortex directly.

Which of these correctly describes the pathway of tasting, starting at the tongue?

1. CNs VII, IX, and X synapse in medulla synapse in thalamus primary sensory cortex

2. Synapse in medulla CNs VII, IX, and X medial lemniscus gustatory cortex synapse in thalamus

3. Tongue CNs VII and IX synapse in pons CN V synapse in thalamus primary sensory cortex

4. None of these is correct

Which type of lingual papillae do not contain taste buds? What is their function?

1. Circumvallate papillae/perception of water molecules

2. Umami papillae/perception of glutamate3. Filiform papillae/provide friction 4. Fungiform papillae/appreciation of texture

Which cranial nerve supplies taste buds located in circumvallate papillae?

1. Glossopharyngeal nerve2. Vagus nerve3. Trigeminal nerve4. Facial nerve

What is the survival value of being more sensitive to sour and bitter tastes than to sweet and salty ones?

1. Sour acids can damage mucous membranes.2. Many potent toxins have a bitter taste.3. Sweet and salty tastes are pleasant, and

therefore good for you.4. 1 and 2 are correct.

Why can corneal transplant surgeries be performed between unrelated individuals without

the risk of rejection?

1. White blood cells rush to the new cornea to fight off infection.

2. There are no blood vessels in the cornea, so white blood cells cannot attack the foreign tissue.

3. Aqueous humor contains powerful antibiotics.4. None of these is correct.

Which of the following is correct concerning the function of the uvea (vascular tunic)?

1. It stabilizes the shape of the eye and produces collagen fibers.

2. It provides the route for the optic nerve and blood vessels to the eye itself.

3. It regulates the amount of light entering the eye.4. It secretes and reabsorbs vitreous humor.

Which of these statements correctly describes the location of rods and cones on the retina?

1. Rods are located in the macula lutea, but only cones are located in the fovea.

2. Cones are located at the periphery of the retina, rods at the center.

3. Rods and cones are evenly distributed on the retina.

4. Cones are located at the center of the retina, rods at the periphery.

Why are rods best suited for night vision?

1. Rods have a low threshold for activation.2. Rods are primarily located within the fovea.3. Rods participate in converging pathways.4. Rods contain several visual pigments.

What is the consequence if drainage of aqueous humor through the canal of Schlemm (scleral

venous sinus) is blocked?

1. Retinitis pigmentosa, leading to blindness.2. Age-related macular degeneration.3. Intraocular pressure increases, leading to

glaucoma.4. Depth perception is lost.

At which interface in the human eye is refraction the greatest?

1. Between air and the cornea2. Between aqueous humor and the lens3. Between the lens and the vitreous body4. Between the vitreous body and the retina

What processes take place for the lens of your eye to become rounder to focus on nearby objects?

1. Ciliary muscle relax and suspensory ligaments pull at the circumference of the lens.

2. New fibers are added to the lens, increasing its refractive power.

3. Ciliary muscles contract, which reduces tension on the suspensory ligaments.

4. The distance between the lens and the macula lutea changes, which keeps focal length constant.

How does vitamin A deficiency affect vision?

1. Photoreceptors are destroyed causing blindness within a few years.

2. The amount of visual pigment in photoreceptors declines, causing poor night vision.

3. The ability of the eyes to accommodate for distance vision decreases.

4. Pupillary reflexes and reflexive eye movement are lost.

When an object appears white, what event has happened?

1. Photons of all colors have been absorbed by the object.

2. Photons of all colors have bounced off the object.3. Rods have been stimulated.4. 2 and 3 are correct.

In what circumstance does colorblindness occur?

1. One or more classes of cones is nonfunctional.

2. Cones are unable to manufacture visual pigments.

3. Certain types of cones are absent.4. All of the above are correct.

What effect does a decrease in phosphodiesterase activity in photoreceptor

cells have on vision?

1. Increased neuron response to photons2. Decreased neuron response to photons3. Increased visual acuity4. Increased light sensitivity

Visual information from the left half of the combined field of vision _________.

1. Arrives at the visual cortex of the right temporal lobe2. Arrives at the superior colliculus on the right side3. Arrives at the visual cortex of the left temporal lobe4. Arrives at the superior colliculus on the left side

What is the function of the auditory tube?

1. It helps amplify sound waves.2. It allows bacteria to travel from the

oropharynx to the middle ear.3. It permits equalization of pressure on either

side of the tympanic membrane.4. It secretes cerumen.

What is the role of the auditory ossicles in hearing?

1. They play a major role in equilibrium.2. They act as levers that conduct vibrations to

the inner ear.3. They vibrate against the round window and

distort the perilymph in the vestibular duct.4. They play no role in hearing.

You are attending an incredibly loud rock concert. What is the reaction of your tensor

tympani to the noise?

1. It extends to allow free movement of the auditory ossicles, thus preventing hearing loss.

2. It extends to prevent all movement of auditory ossicles.

3. It contracts to reduce movement of the stapes. 4. It contracts to pull the malleus medially and

stiffens the tympanic membrane.

Which structures comprise the major subdivisions of the bony labyrinth?

1. Anterior, posterior, and lateral semicircular ducts2. Middle ear, inner ear, and membranous labyrinth3. Vestibule, three semicircular canals, and the

cochlea4. Vestibule, saccule, and utricle

Where are the sensory receptors that respond to rotational movements of the head?

1. In the utricle and saccule2. In the anterior, posterior, and lateral

semicircular ducts3. In the cochlear duct 4. In the vestibular duct and tympanic duct

The receptors for hearing are located in _____, which is filled with ______.

1. The organ of Corti in the cochlear duct/endolymph2. Hair cells in the vestibular duct/perilymph3. The tectorial membrane in the tympanic

duct/perilymph 4. None of these is correct

Which of the following characteristics of sound determines how loud a sound seems?

1. Decibels2. Pitch3. Frequency4. Amplitude

Where do low-frequency sounds vibrate the basilar membrane? Why?

1. Near the round window/perilymph is incompressible 2. Near the oval window/shorter wavelength3. Far from the oval window/longer wavelength4. Against the tectorial membrane/pressure waves are

created in endolymph of the vestibular duct