Multiple Choice
Which of the following cell types in the epidermis is primarily responsible for producing the protein keratin?
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4. Tissues & Histology
Introduction to Epithelial Tissue
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In the context of epithelial tissue, what type of epithelium most commonly lines the digestive tract (stomach through rectum)?
A
Simple squamous epithelium
B
Simple columnar epithelium
C
Pseudostratified ciliated columnar epithelium
D
Transitional epithelium
Verified step by step guidance1
Step 1: Understand the function of the digestive tract lining. The epithelium lining the digestive tract must facilitate absorption and secretion, which are key functions in digestion.
Step 2: Review the characteristics of each epithelial type listed: Simple squamous epithelium is thin and flat, ideal for diffusion but not for absorption or secretion; Pseudostratified ciliated columnar epithelium is typically found in the respiratory tract and helps move mucus; Transitional epithelium is specialized for stretching and is found in the urinary system.
Step 3: Recognize that the digestive tract lining requires cells that are taller and have more cytoplasm to accommodate organelles for secretion and absorption, which is characteristic of columnar cells.
Step 4: Identify that 'simple columnar epithelium' consists of a single layer of tall, column-shaped cells, making it well-suited for absorption and secretion in the stomach through the rectum.
Step 5: Conclude that the most common epithelial type lining the digestive tract from the stomach through the rectum is simple columnar epithelium, due to its structure and function.
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