Exam 43: Sensory Systems

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

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

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?

Which of the following animals does NOT have electroreceptors?

Which of the vertebrates senses is the least well understood?

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

At night,faint objects are best seen when not looked at directly.What is the basis of this phenomenon?

You decide to perform an experiment to test this why plants possess TRP channel agonists.You first set up batches of plants in the field WITH or WITHOUT applied capsaicin or menthol.What parameter do you then measure?

Why are carrots said to be good for you?

If genetically engineered bees could express a receptor for TNT in their olfactory neurons,what type of receptor would the TNT receptor be?

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

As CO₂ builds up in the atmosphere it also accumulates in the oceans,causing acidification.This poses a challenge to marine creatures that rely on calcium carbonate deposition such as corals,mollusks,and even fish,which use it to form otoliths.Researchers investigated whether otolith deposition was impaired at low pH,and were surprised to find that otoliths were actually larger in this condition.This means that,while coping with global climate change,at least fish will still be able to maintain which sense(s)?

Which sensory modality responds to the broadest range of molecules?

Which animal is NOT able to use sonar as a form of "lightless vision" to navigate in dark environments?

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

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.

One patient at your audiology clinic has an actin defect,and another patient has a microtubule defect.What sense other than hearing may be affected in these patients?

Where is the visual image in focus for a nearsighted individual?

Unlike sweet,salty,sour,or umami,the "bitter" category of tastants includes wide structural variety of detected molecules.Multiple receptors are required to sense the different bitter tastants.What do they have in common? Bitter taste is thought to have evolved as a warning system for toxic compounds. -The bitter receptor hTAS2R38 is activated by glucosinolates found in plants such as turnips and broccoli.The gene variant a person has determines how sensitive their neurons are to these compounds.What would you predict for people who have the high-sensitivity variant of hTAS2R38?

What are the short retinal photoreceptors responsible for color vision called?