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Chapter 18: Problem 1

Which of the following has the fewest taste receptors? a. fungiform papillae b. circumvallate papillae c. foliate papillae d. liform papillae

Short Answer

Expert verified
Answer: Liform papillae.

Step by step solution

01

Define the types of papillae

a. Fungiform papillae: Mushroom-shaped and primarily located on the front two-thirds of the tongue, containing taste buds on their upper surface. b. Circumvallate papillae: Circular structures found at the back of the tongue, arranged in a V-shape and surrounded by a trench-like structure, also housing taste buds. c. Foliate papillae: Found in folds on the sides of the tongue, with taste buds embedded within the folds. d. Liform papillae: Small and elongated, these are found around the edges of the tongue, primarily involved in sensing texture and do not contain taste buds.
02

Compare the taste receptor densities

From the given definitions, the following observations can be made regarding the densities of taste receptors in each type of papillae: a. Fungiform papillae: Moderate density of taste receptors, as they contain taste buds on the upper surface. b. Circumvallate papillae: High density of taste receptors, due to the presence of multiple taste buds within the trench-like structure. c. Foliate papillae: Moderate density of taste receptors, since taste buds are located in the folds of these papillae. d. Liform papillae: No taste receptors, as they are involved in sensing texture and not taste.
03

Select the answer

Based on the analysis of the taste receptor densities of the different types of papillae, it can be concluded that liform papillae (option d) have the fewest taste receptors of the given choices. This is because they do not contain any taste buds and are primarily involved in sensing texture.

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