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The immune system protects the body from pathogens through two main branches: innate immunity (immediate, non-specific defense) and adaptive immunity (slower, specific, and memory-based response).
• Innate immunity: First line of defense including physical barriers, phagocytes, and inflammatory response • Adaptive immunity: T cells and B cells that provide targeted, long-lasting protection • Antigens: Molecules that trigger immune responses • Antibodies: Y-shaped proteins produced by B cells that bind to specific antigens
Pathogen: A disease-causing organism such as bacteria, viruses, or parasites. Phagocytosis: The process by which immune cells engulf and destroy pathogens. Memory cells: Long-lived lymphocytes that enable faster response to previously encountered pathogens.
Q: How does vaccination create immunity? A: Vaccines expose the immune system to weakened or inactive pathogens, triggering memory cell formation without causing disease. Q: What distinguishes innate from adaptive immunity? A: Innate immunity is immediate and non-specific; adaptive immunity is slower but specific and creates lasting memory.
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