The epithelia that line body cavities and blood vessels are classified as:

• A. Transitional epithelium
• B. Simple cuboidal epithelium
• C. Simple squamous epithelium
• D. Stratified squamous epithelium

Answer: (C)

Verified step by step guidance

1. Understand the classification of epithelial tissue: Epithelial tissues are classified based on the number of layers (simple or stratified) and the shape of the cells (squamous, cuboidal, or columnar).
2. Identify the function and location of simple squamous epithelium: Simple squamous epithelium consists of a single layer of flat cells and is specialized for diffusion and filtration. It is commonly found lining body cavities (mesothelium) and blood vessels (endothelium).
3. Compare the characteristics of other epithelial types: Transitional epithelium is found in areas like the urinary bladder and is specialized for stretching. Simple cuboidal epithelium is found in glands and kidney tubules, where secretion and absorption occur. Stratified squamous epithelium is found in areas subject to abrasion, such as the skin and esophagus.
4. Match the structural and functional requirements of the lining of body cavities and blood vessels: These areas require a thin, flat layer of cells to facilitate efficient exchange of substances, which aligns with the properties of simple squamous epithelium.
5. Conclude that the correct classification for the epithelia lining body cavities and blood vessels is simple squamous epithelium, based on its structure and function.