Exam 44: Sensory Systems

Researchers studying olfactory and taste receptors have stumbled upon an unusual phenomenon.These receptor proteins are sometimes expressed in other animal tissues in addition to the nose or tongue.For example, the sweet taste receptor T1R2 is expressed in the pancreas.Suggest the best possible explanation for these findings.

If genetically engineered bees could express a receptor for TNT in their olfactory neurons, how would the bees respond to the presence of TNT?

Which sensory modality responds to the broadest range of molecules?

After your eye exam, the optometrist breaks the bad news: "Your lens is a little too flat, and as a result it is focuses the image just in front of your retina." What kind of vision do you have?

Because small quantities of powerful explosives can be hidden easily, a sensor that could detect trace amounts of illicit chemicals would be a useful tool.What animal sensory modality is exquisitely sensitive to minute quantities of airborne chemicals?

In what order will you encounter the following structures if you examine the human ear from the outside inward?

Which is NOT a stimulus that interoceptors can sense?

Which of the vertebrates senses is the least well understood?

One patient at your audiology clinic has an actin defect, and another patient has a microtubule defect.How might these defects affect the function of their hair cells in hearing?

Which of the following statements regarding vision is NOT true?

Which correctly represents the sequence of steps involved to convey sensory information to the CNS?

Which sequence of events is required for the brain to interpret sound? I.Vibration of the basilar membrane relative to the tectorial membrane causes cilia on hair cells to bend and triggers depolarization.II.Hair cells stimulate the production of action potentials in sensory neurons that project to the brain.III.Ganglion cell axons transmit action potentials to the occipital lobe.

Visual acuity is highest when an image is focused on what part of the retina?

Which is NOT a stimulus that the simplest sensory receptors, free nerve endings, will respond to?

Which of the following receptors does not trigger depolarization of a sensory neuron?

Misexpression of the Pax6 gene was shown to promote eye development in both vertebrates and invertebrates.The authors of this study suggested that this was evidence that eyes evolved only once.What other evidence contradicts this view?

What are the sensory structures that enable invertebrates to determine the orientation of the body with respect to gravity called?

Pain receptors are activated by tissue damage, but pain perception requires intact, functional neurons.How does this work?

What is the most likely hypothesis for the presence of TRP channel agonists in plants?

Which of the following stimuli do vertebrates NOT have a specialized receptor for?