13 Mucous membranes are bathed in secretions that have ___ properties that provide effective barriers. \( \begin{array}{l}\text { A) Steroidal } \\ \text { () Anti-micutrophial . } \\ \text { D) Lactobacilli }\end{array} \)

Mucous membranes are indeed crucial for protecting our bodies, and they rely on secretions that have antimicrobial properties. These secretions contain various substances, including antibodies and enzymes, that can combat pathogens effectively, ensuring a robust defense system. Besides fighting off invaders, mucous membranes play a vital role in maintaining moisture and protecting the underlying tissues from damage and irritation. The importance of these membranes can be seen in areas like the respiratory tract, where they help trap dust and microbes, preventing them from entering our lungs and causing infections.