Intact skin resists invasion by organisms by impedment of bacterial colonization. (pH 3-5) trapping bacteria and other foreign substances. washing away or diluting microorganisms. preventing their attachment.

The problem statement describes how intact skin acts as a barrier against organisms, particularly bacteria. Let's break down the known conditions and the mechanisms by which skin resists invasion: 1. **pH Level**: The skin has a pH level of 3-5, which is slightly acidic. This acidity can inhibit the growth of many pathogenic organisms. 2. **Mechanisms of Resistance**: - **Impedment of Bacterial Colonization**: The skin's surface can prevent bacteria from settling and multiplying. - **Trapping Bacteria and Foreign Substances**: The skin can physically trap bacteria and other foreign particles, preventing them from entering the body. - **Washing Away or Diluting Microorganisms**: Natural processes, such as sweating and the action of sebum, can help wash away or dilute microorganisms. - **Preventing Attachment**: The skin's structure and secretions can prevent bacteria from adhering to its surface. ### Conclusion Intact skin employs multiple mechanisms to resist invasion by organisms, including maintaining an acidic pH, trapping foreign substances, washing away microorganisms, and preventing bacterial attachment. Each of these factors contributes to the skin's role as a protective barrier.