Question

match each of the four barriers of innate immunity with its mode of action. anatomical barrier physiological barrier phagocytic barrier inflammatory barrier secretion of sweat, saliva, and tears secretion of chemicals signaling to macrophages changes in ph and temperature

Explanation:

1. Anatomical barrier: Physical structures (like skin, mucous membranes) and their secretions (sweat, saliva, tears) act as a first - line physical block. So "secretion of sweat, saliva, and tears" matches with anatomical barrier.
2. Physiological barrier: Involves chemical (like enzymes in secretions) and physical (pH, temperature) conditions that inhibit pathogens. "Changes in pH and temperature" are part of physiological conditions that prevent pathogen growth, so it matches with physiological barrier.
3. Phagocytic barrier: Phagocytes (like macrophages) are signaled to engulf and destroy pathogens. So "signaling to macrophages" matches with phagocytic barrier.
4. Inflammatory barrier: Inflammation involves the secretion of chemicals (like cytokines, histamines) to recruit immune cells and fight infection. So "secretion of chemicals" matches with inflammatory barrier.

Answer:

• "secretion of sweat, saliva, and tears" → anatomical barrier
• "secretion of chemicals" → inflammatory barrier
• "signaling to macrophages" → phagocytic barrier
• "changes in pH and temperature" → physiological barrier