Unit 1 - Sensory Organs

Question 1

From which of the following layers of the developing embryo do the eyes develop?
endoderm
mesoderm
ectoderm
more than one
none of these

Answer 1

ANSWER: ectoderm

Question 2

Binocular Vision

Answer 2

gives better depth perception

Question 3

During embryonic development, the first portion of the ear to develop is the

Answer 3

internal ear

Question 4

The olfactory tract

Answer 4

projects directly to the primary olfactory cortex and to the limbic system and hypothalamus

Question 5

which is the correct order in the flow of tears ?

Answer 5

lacrimal gland, lacrimal duct, superior or inferior lacrimal canal, lacrimal sac, nasolacrimal duct, nasal cavity.

Question 6

which structure regulates the amount of light entering the eyeball through the pupil ?

Answer 6

iris

Question 7

which of these types of receptors listed below is primarily used for detecting light rays under bright light conditions?

Answer 7

cones

Question 8

infection of a sebaceous ciliary gland can result in

Answer 8

a sty

Question 9

which of the following statements accurately describes the changes in the membrane potential of a photoreceptor cell when light rays strike its photopigments ?

Answer 9

the photoreceptor cell undergoes hyperpolarization

Question 10

which of the following nerves conducts impulses associated with the sense of gustation ?

Answer 10

vagus

Question 11

which of the following structures carries action potentials generated by sound transduction?

Answer 11

vestibulocochlear nerve

Question 12

Adaptation of the olfactory sense to the continued presentation of an odorant

Answer 12

Occurs rapidly

Question 13

Olfactory receptors are found

Answer 13

Only in the superior portion of the nasal cavity

Question 14

How many days after fertilization do the ears begin to develop?

Answer 14

22

Question 15

The axons of the ganglion neurons of the retina terminate the

Answer 15

Lateral geniculate nucleus of the thalamus

Question 16

What structure vibrates back and forth when sound waves strike it?

Answer 16

Tympanic membrane

Question 17

The vestibular nuclei of the brain stem that control equilibrium receives sensory information from all the following areas EXCEPT the

Answer 17

Nociceptors in the distal limbs

Question 18

Which of the following are structures of the membranous labyrinth of the inner ear that are involved in dynamic and static equilibrium?

Answer 18

Vestibule, saccule, cochlear duct, semicircular ducts (answer, more than one of these is correct)

Question 19

Which of the following structures obtains otoliths (ear stones)?

Answer 19

Macula of the saccule

Question 20

What lies between the lens and the retina?

Answer 20

Vitreous chamber

Question 21

This is a thin mucous membrane that protects the inner aspect of the eyelids and the portion of the sclera covering the anterior surface of the eyeball.

Answer 21

Conjuctiva

Question 22

Which layer of dense connective tissue serves to protect the inner parts of the eyeball?

Answer 22

Sclera

Question 23

Nerve impulses for the sense of hearing are initiated in the spiral organ (organ of Corti) and then travel through the _____ to the _____.

Answer 23

Cochlear branch of the cranial nerve VIII; medulla oblongata

Question 24

During embryonic development, the lens of the eye develops directly from an invagination of the lens placodes called the

Answer 24

Lens vesicle

Question 25

Which of the following structures senses change in rotational acceleration of the head in order to help maintain dynamic equilibrium?

Answer 25

Semicircular canals

Question 26

The lens is made of layers of proteins called

Answer 26

Crystallins

Question 27

Which of the following molecules is capable of detecting light rays that strike the photopigments in the retina?

Answer 27

Cis-retinal

Question 28

These receptor cells provide for the sense of taste.

Answer 28

Gustatory cells

Question 29

Which of the following types of papillae do NOT contain taste buds?

Answer 29

Filiform

Question 30

The smell receptors that actually bind the odorants and begin signal transduction are located on

Answer 30

Olfactory hairs

Question 31

H which of the following is the transparent layer on the anterior of the eyeball through which the iris can be observed?

Answer 31

Cornea

Question 32

Cataracts lead to blindness due to

Answer 32

Loss of transparency of the lens.

Question 33

Presbycusis refers to age-associated

Answer 33

Progressive loss of hearing in both ears.

Question 34

During embryonic development, the middle ear develops from a structure called the first

Answer 34

Pharyngeal pouch

Question 35

Which sensory structure in the inner ear is capable of sensing rapid rotation of your head to the left?

Answer 35

Crista of a semicircular duct

Question 36

During embryonic development, the external ear develops from a structure called the first

Answer 36

Pharyngeal cleft

Question 37

Which darkly pigmented structure reduces light reflection within the eyeballs?

Answer 37

Choroid

Question 38

How many extrinsic eye muscles are responsible for moving each eye?

Answer 38

6

Question 39

Taste buds are found on

Answer 39

The epiglottis, the pharynx, the soft palate (all of these choices)

Question 40

How many days after fertilization do the eyes begin to develop?

Answer 40

22

Question 41

Which of the structures listed below converts vibrations in the endolymph into action potentials?

Answer 41

Organ of corti

Question 42

Which is NOT considered an accessory structure of the eye?

Answer 42

Retina

Question 43

The first step in the visual transduction process that occurs in the retina is

Answer 43

Absorption of light by photopigments

Question 44

Which of the following is the space between the upper and lower eyelids?

Answer 44

Palpebral fissure

Question 45

as sound levels increase in the spiral organ of corti,

Answer 45

Outer hair cells stiffen the basilar membrane

Question 46

Select the correct statement about olfaction

Answer 46

Some of the sensation of olfaction is actually one of pain

Question 47

Dark adaptation _____.

Answer 47

Involves accumulation of rhodopsin

Question 48

Olfactory cells and taste buds are normally stimulated by _______.

Answer 48

Substances in solution

Question 49

The tarsal plate of the eyelid _______.

Answer 49

Is connected to the levator palpebrae

Question 50

Select the correct statement about equilibrium.

Answer 50

Cristae respond to angular acceleration and deceleration

Question 51

Which layer of dense connective tissue serves to protect the inner parts of the eyeball?

Answer 51

Sclera

Question 52

Which of the following structures carries action potentials generated by sound transduction?

Answer 52

Vestibulocochlear nerve