Final answer:
The intermediate layer of the three-layer dressing absorbs wound secretions. The function of an antiseptic is to control microbes on live tissues. Tight junctions are used by tissues as a defense against microbial entry.
Step-by-step explanation:
The part of the three-layer dressing absorbs wound secretions in the intermediate layer. This layer often contains absorbent materials that pull in fluids such as pus, blood, and other wound exudates to protect the wound and promote healing. The outer layer is typically the protective layer that shields the wound from external contaminants, while the innermost layer is usually non-adherent to prevent disturbance of the healing wound when the dressing is changed.
In terms of microbial control for tissues, an antiseptic is suitable as it is gentle enough for use on skin and tissues but still effective at reducing or preventing infection. Lastly, tissues use tight junctions, particularly in areas prone to microbial entry, as a defense mechanism to prevent microbes from penetrating and infecting underlying tissues.