Which type of epithelial membrane lines body cavities that are open to the exterior?

• A. Cutaneous membrane
• B. Mucous membrane
• C. Serous membrane
• D. Synovial membrane

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the concept of epithelial membranes. Epithelial membranes are composed of epithelial tissue and an underlying layer of connective tissue. They serve various functions, including protection, secretion, and absorption.
2. Step 2: Review the types of epithelial membranes. There are three main types: mucous membranes, serous membranes, and cutaneous membranes. Additionally, synovial membranes are not epithelial but connective tissue membranes.
3. Step 3: Focus on mucous membranes. Mucous membranes line body cavities that are open to the exterior, such as the respiratory, digestive, urinary, and reproductive tracts. They secrete mucus to keep the surfaces moist and protect against pathogens.
4. Step 4: Compare mucous membranes to other types. Cutaneous membranes (skin) cover the body surface and are exposed to the exterior but do not line cavities. Serous membranes line closed cavities and secrete serous fluid. Synovial membranes are found in joint cavities and secrete synovial fluid.
5. Step 5: Conclude that mucous membranes are the correct type of epithelial membrane that lines body cavities open to the exterior, based on their structure and function.