Question 1

Which of the following statements about sensory cells is false?

Accepted Answer

A)  Most sensory cells are modified neurons. 
B)  Sensory cells can respond equally to all types of stimuli. 
C)  Changes in stimulus strength lead to changes in a sensory cell's receptor potential. 
D)  Sensory cells display a phenomenon called adaptation. 
E)  Some are assembled with other cell types that enhance the sensory cells' ability to collect, filter, and amplify stimuli. 
A)  Most sensory cells are modified neurons. 
B)  Sensory cells can respond equally to all types of stimuli. 
C)  Changes in stimulus strength lead to changes in a sensory cell's receptor potential. 
D)  Sensory cells display a phenomenon called adaptation. 
E)  Some are assembled with other cell types that enhance the sensory cells' ability to collect, filter, and amplify stimuli.

Question 2

Hair cells have a set of projections called _______ that open _______ when they bend.

Accepted Answer

stereocili

Question 3

Which statement is not true?

Accepted Answer

A)  The transmembrane potential of a rod cell becomes more negative when the rod cell is exposed to light. 
B)  A photoreceptor releases the most neurotransmitter when in total darkness. 
C)  Whereas in vision the intensity of a stimulus is encoded by the degree of hyperpolarization of photoreceptors, in hearing the intensity of a stimulus is encoded by changes in firing rates of sensory neurons. 
D)  Stiffening of the ossicles in the middle ear can lead to deafness. 
E)  The interaction among hammer (malleus), anvil (incus), and stirrup (stapes) conducts sound waves across the fluid-filled middle ear. 
A)  The transmembrane potential of a rod cell becomes more negative when the rod cell is exposed to light. 
B)  A photoreceptor releases the most neurotransmitter when in total darkness. 
C)  Whereas in vision the intensity of a stimulus is encoded by the degree of hyperpolarization of photoreceptors, in hearing the intensity of a stimulus is encoded by changes in firing rates of sensory neurons. 
D)  Stiffening of the ossicles in the middle ear can lead to deafness. 
E)  The interaction among hammer (malleus), anvil (incus), and stirrup (stapes) conducts sound waves across the fluid-filled middle ear.

Question 4

Pheromones are chemical signals that can signal from _______ to _______.

Accepted Answer

A)  one neuron; another 
B)  the peripheral nervous; the central nervous system 
C)  prey; predator 
D)  parasite; host 
E)  female; male within a species 
A)  one neuron; another 
B)  the peripheral nervous; the central nervous system 
C)  prey; predator 
D)  parasite; host 
E)  female; male within a species

Question 5

Which of the following statements about gustation is false?

Accepted Answer

A)  Taste receptors may be either ionotropic or metabotropic. 
B)  All stimulated taste sensory neurons respond by generating an action potential. 
C)  Microvilli increase the surface area of taste sensory cells. 
D)  Individual taste buds are replaced every few months. 
E)  Taste sensory cells form synapses with dendrites of sensory neurons. 
A)  Taste receptors may be either ionotropic or metabotropic. 
B)  All stimulated taste sensory neurons respond by generating an action potential. 
C)  Microvilli increase the surface area of taste sensory cells. 
D)  Individual taste buds are replaced every few months. 
E)  Taste sensory cells form synapses with dendrites of sensory neurons.

Question 6

Which of the following statements about the photosensitive molecule rhodopsin is false?

Accepted Answer

A)  Opsin is converted from the 11-cis to the all-trans form upon absorbing a photon of light. 
B)  The retinal is the light-absorbing group. 
C)  Photoexcited rhodopsin triggers a cascade of reactions that ultimately alters the membrane potential of a photoreceptor cell. 
D)  Opsin is a protein; retinal is not a protein. 
E)  11-cis-retinal is covalently bonded to opsin. 
A)  Opsin is converted from the 11-cis to the all-trans form upon absorbing a photon of light. 
B)  The retinal is the light-absorbing group. 
C)  Photoexcited rhodopsin triggers a cascade of reactions that ultimately alters the membrane potential of a photoreceptor cell. 
D)  Opsin is a protein; retinal is not a protein. 
E)  11-cis-retinal is covalently bonded to opsin.

Question 7

Which of the following statements about sensory receptor proteins is false?

Accepted Answer

A)  Ionotropic receptor proteins are either ion channels themselves or they directly influence the opening of ion channels. 
B)  Photoreceptors are ionotropic. 
C)  Mechanoreceptors are ionotropic. 
D)  Thermoreceptors are ionotropic. 
E)  Metabotropic receptors influence ion channels indirectly through second messengers. 
A)  Ionotropic receptor proteins are either ion channels themselves or they directly influence the opening of ion channels. 
B)  Photoreceptors are ionotropic. 
C)  Mechanoreceptors are ionotropic. 
D)  Thermoreceptors are ionotropic. 
E)  Metabotropic receptors influence ion channels indirectly through second messengers.

Question 8

A person with impaired ciliary muscles would have trouble

Accepted Answer

A)  hearing low pitches. 
B)  focusing on both near and far images. 
C)  seeing subtle changes in color. 
D)  tasting bitter tastes. 
E)  None of the above 
A)  hearing low pitches. 
B)  focusing on both near and far images. 
C)  seeing subtle changes in color. 
D)  tasting bitter tastes. 
E)  None of the above

Question 9

Chemoreceptors

Accepted Answer

A)  are possessed by all animals. 
B)  can cause strong behavioral responses. 
C)  do not undergo adaptation. 
D)  Both a and b 
E)  All of the above 
A)  are possessed by all animals. 
B)  can cause strong behavioral responses. 
C)  do not undergo adaptation. 
D)  Both a and b 
E)  All of the above

Question 10

Sensory transduction begins with a membrane receptor protein on sensory receptor cells that can detect all of the following except

Accepted Answer

A)  heat. 
B)  magnetic waves. 
C)  mechanical force. 
D)  light. 
E)  chemicals. 
A)  heat. 
B)  magnetic waves. 
C)  mechanical force. 
D)  light. 
E)  chemicals.

Exam 46: Sensory Systems

Which of the following statements about sensory cells is false?

Hair cells have a set of projections called _______ that open _______ when they bend.

Which statement is not true?

Pheromones are chemical signals that can signal from _______ to _______.

Which of the following statements about gustation is false?

Which of the following statements about the photosensitive molecule rhodopsin is false?

Which of the following statements about sensory receptor proteins is false?

A person with impaired ciliary muscles would have trouble

Chemoreceptors

Sensory transduction begins with a membrane receptor protein on sensory receptor cells that can detect all of the following except

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Filters

Hair cells have a set of projections called _ that open _ when they bend.

Pheromones are chemical signals that can signal from _ to _.