Problem 6 - Biology: The Dynamic Science

Question

A specialized region of the gut is/are the: a. submucosa formed by circular and longitudinal layers. b. serosa lining the gut for absorption. c. mucosa composed of thick elastic connective tissue for movement. d. muscularis, an outer layer that secretes a slippery material to prevent friction with other organs. e. sphincters, which form valves between major digestive organs.

Step-by-Step Solution

Answer

The correct answer is e. Sphincters, which form valves between major digestive organs.

Step 1: Analyzing the Options

First, look carefully at each option. It is necessary to have some previous knowledge about the anatomy and physiology of the digestive tract. Remember, each part of the digestive tract has specific characteristics and performs specific functions, and these functions are the main hints to find the correct answer.

Step 2: Comparing to Known Information

Compare each option against the known functions of the different parts of the gut. The submucosa (option a) and muscularis (option d) are involved in the movement of the gut but not as described in the options. The serosa (option b) is indeed a lining, but its primary function is not absorption. The mucosa (option c) is not composed of thick elastic connective tissue and it does not have a primary function of movement.

Step 3: Identifying the Answer

Option e talks about sphincters which form valves between major digestive organs. This accurately describes a specialized region in the gut as sphincters are in fact specialized structures that regulate the movement of substances from one part of the digestive tract to another.