Review Questions
1. What type of receptor cell is responsible for transducing pain stimuli?
2. Which of these cranial nerves is part of the gustatory system?
3. Which submodality of taste is sensitive to the pH of saliva?
4. Axons from which neuron in the retina make up the optic nerve?
5. What type of receptor cell is involved in the sensations of sound and balance?
1. The sweetener known as stevia can replace glucose in food. What does the molecular similarity of stevia to glucose mean for the gustatory sense?
Solution: The stevia molecule is similar to glucose such that it will bind to the glucose receptor in sweet-sensitive taste buds. However, it is not a substrate for the ATP-generating metabolism within cells.
2. Why does the blind spot from the optic disc in either eye not result in a blind spot in the visual field?
Solution: The visual field for each eye is projected onto the retina as light is focused by the lens. The visual information from the right visual field falls on the left side of the retina and vice versa. The optic disc in the right eye is on the medial side of the fovea, which would be the left side of the retina. However, the optic disc in the left eye would be on the right side of that fovea, so the right visual field falls on the side of the retina in the left field where there is no blind spot.
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