Chapter 15 Mastering Homework+Practice Test

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

________ glands produce a secretion commonly called earwax.

ceruminous

The human lens focuses light on the photoreceptor cells by

changing shape

The sensory neurons within the olfactory organ are stimulated by ________ in the air.

chemicals

What structure changes the shape of the lens for far and near vision?

ciliary body

Which structure supports the lens and controls its shape?

ciliary body

The hair cells of the utricle and saccule are clustered in

maculae

The middle ear communicates with the nasopharynx through the

pharyngotympanic tube

The visual receptors of the retina are called

photoreceptors

There are three different types of cones, each one sensitive to different light energies. These cones are designated

red, green, and blue

When light encounters a medium of different density, it is bent or

refracted

Visual pigments are derivatives of the compound

rhodopsin

In the retina, the correct sequence of neural wiring is

rod - bipolar cell - ganglion cell - thalamus.

________ are photoreceptor cells that are most useful in dim light.

rods

Gravity and linear acceleration are sensed in the

saccule and utricle

The visible spectrum for humans extends between a wavelength of 400 nm and ________ nm.

700

Describe olfaction. (Module 15.2A)

Olfaction is the sense of smell.

When the basilar membrane moves, what happens to the hair cells of the spiral organ? (Module 15.19C)

They press against the tectorial membrane.

Taste buds are monitored by cranial nerves

VII, IX, and X.

In which of the following cases would the focal distance be greater?

a flat lens

The sensory receptors of the semicircular canals are located in the

ampullae

The space between the cornea and the iris is the

anterior chamber

Before an olfactory receptor can detect an odorant, it has to

bind to receptors in olfactory dendrites

________ cells connect photoreceptors to ganglion cells.

bipolar

Myopia __________.

can be treated by placing a diverging lens in front of the eye

Where is the spiral organ located? (Module 15.19A)

cochlea of the internal ear

Which of the following is not true of the vascular layer of the eye?

contains photoreceptors

Which type of lens would correct hyperopia? (Module 15.14B)

converging lens (with at least one convex surface)

A ray of light entering the eye will encounter these structures in which order?

cornea - aqueous humor - lens - vitreous body - retina - choroid

When dissolved chemicals contact the dendritic processes of olfactory receptors, what occurs as a result of second messenger activation?

depolarization

An area of the retina that contains only cones and is the site of sharpest vision is the

fovea centralis.

The axons of which cells converge at the optic disc to form the blind spot?

ganglion cells

What kind of stimuli can the internal ear sense? (Module 15.15C)

gravity and acceleration, rotation, or sound

The sense of taste is also known as

gustation

The tensor tympani muscle:

inserts on the "handle" of the malleus.

The senses of equilibrium and hearing are provided by receptors of the

internal ear

The part of the eye that determines eye color is the

iris

Which of the following descriptions best matches the term basilar membrane?

moves up and down when the stapes moves back and forth

A person suffering from ________ can see objects that are close, but distant objects appear blurred.

myopia

Olfactory receptors send axons through the cribriform plate. They synapse on neurons in the

olfactory bulb

The function of gustatory receptors parallels that of

olfactory receptors

What is the eye's blind spot? (Module 15.10A)

optic disc

The hair cells of the cochlear duct are located in the

organ of Corti

Which of the following is not one of the six taste sensations?

peppery

Which of the following descriptions best matches the term stapes?

seals the oval window

Movement of the endolymph in the semicircular canals

signals rotational movements.

When the ciliary muscles are relaxed, are you viewing something close up or something in the distance? (Module 15.9B)

something in the distance

Which of the following gustatory receptors do not rely on the activation of second messengers to stimulate release of chemical neurotransmitters?

sour

The structure that overlies the organ of Corti is the

tectorial membrane

Perception of gravity and linear acceleration depends on

the force exerted by otoliths on hair cells of the maculae in the utricle or saccule.

What happens to the pupils when light intensity decreases? (Module 15.8B)

the pupils dilate to let in more light

Sound waves are converted into mechanical movements by the

tympanic membrane

The external ear ends at the

tympanic membrane

The auditory ossicles connect the

tympanic membrane to the oval window.

The taste sensation that is triggered by the amino acids and small peptides is known as

umami

Where are visual images perceived? (Module 15.13B)

visual cortex of the occipital lobe

When analyzing sound waves in the ear, the number of hair cells stimulated is interpreted as which characteristic?

volume


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