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Exam 9: Sensory Systems

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Question 31

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A person has a condition whereby their ciliary muscles do not contract to the degree that they should as they are trying to focus on nearby objects. There is some evidence that this may result from overworking the eyeball by trying to focus on nearby objects. Which of the following conditions would produce symptoms similar to the patient described here?

A) myopia
B) hyperoptia
C) astigmatism
D) hypermetroptia

E) None of the above
F) All of the above

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Question 32

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Melissa develops a cyst in her spinal cord that damages her dorsal column pathway. This would alter Melissa's ability to perceive all of the following sensations, EXCEPT

A) proprioception
B) temperature
C) touch
D) vibration

E) C) and D)
F) B) and C)

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Question 33

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Which receptors underlie sensations of vibration?

You are in line at the grocery store and the cashier tells you that you need to pay $2.34 cents, so you reach into your pocket and count two dimes, two nickels and four pennies before pulling them all out and handing them to the cashier. Which area in your brain allowed you to count the coins correctly without seeing them?

The cells that receive direct input from cones and relay that input to ganglion cells are called

IP₃ leads to a receptor potential in some gustatory neurons due to opening of what type of channel?

Which type of cell can divide to produce new olfactory receptor cells?

When your eyes are exposed to more light, the pupils constrict limiting the amount of light entering the eye, and as a result the photoreceptors in the retina reduce the amplitude of the resulting graded potentials. What is the most likely reason for this response?

Traditional pirates often wore eye patches to keep one eye "dark adapted" (fully dilated) so that they could navigate better on dark nights out on the ocean. However, as long as the pirate wears his eye patch over his left eye during the day, visual information he receives in his right eye is conveyed to which side of his brain?

When you feel the urge to scratch your leg, which nervous fibers are most likely being stimulated?

Olfactory transduction involves binding of an odorant molecule to a receptor protein that in turn activates the G_olf protein.

You walk into your house and smell a weak, foul odor. You walk from room to room and the odor becomes stronger, until eventually it becomes extremely powerful and you find a sandwich you had dropped behind the couch that had rotted. Which of the following are occurring in your olfactory receptor cells as you search out the source of the odor?

How is stimulus duration encoded by graded potentials in the nervous system?

The Venus fly trap is a carnivorous plant that eats insects that land on it and become trapped inside of its jaw-like leaves. The struggling of the insects moves hairs on the plant surface that trigger the trap to close tight. This mechanism is analogous to which type of touch receptor in humans?

Transient receptor potential channels can transduce temperature, pain and gustatory stimuli.

The axons of sensory neurons project to the cerebral cortex.

Which of the following area(s) of the body lack nociceptors?

The dendrites of olfactory receptor cells are located in the

Which cells serve as the primary sensory receptors of the cochlea?

When an odorant molecule binds to a receptor protein, what type of signaling pathway is activated?