Immune System: A complex network of cells, tissues, and organs that defend the body against pathogens by recognizing and eliminating foreign invaders while distinguishing them from self-cells.
Pathogen: A microorganism such as bacteria, viruses, fungi, or parasites that causes disease.
Antigen: A substance, often a protein or polysaccharide, that triggers an immune response by being recognized as foreign by immune cells.
Innate Immunity: The body's immediate, non-specific defense mechanism that responds rapidly to pathogens using physical barriers, chemical defenses, and immune cells like macrophages and natural killer cells.
Adaptive Immunity: A specific immune response involving lymphocytes (B and T cells) that develops over time, has memory, and provides long-lasting protection against particular pathogens.
Lymphatic System: A network of vessels, lymph nodes, and organs that transports lymph fluid, filters pathogens, and facilitates immune cell activation.
1. What is the lymphatic system?
2. What is the primary role of antigen in the immune system?
3. Which of the following is a specific component of innate immunity involving plasma proteins that enhances immune responses?
Immune System — definition?
Network defending against pathogens.
Immune System — function?
Defends body using innate and adaptive responses.
Innate Immunity — components?
Physical barriers, phagocytes, NK cells, complement.
Pathogen — definition?
Microorganism causing disease.
Adaptive Immunity — elements?
B cells, T cells, memory, MHC molecules.
Antigen — role?
Triggers immune response.
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