Question

Innate immunity is a non-specific type of defense and consists of four types of barriers. Categorize these barriers and give one example for each

Answer 1

• Physical barriers- skin, mucus, digestive tract. 
• Physiological barriers- sweat, saliva, tears, and acid secreted in the stomach. 
• Cellular barriers- leukocytes, monocytes, natural killer cells, and macrophages. 
• Cytokine barriers- interferons.