Immune system
from class:
Pharmacology for Nurses
Definition
The immune system is a complex network of cells, tissues, and organs that work together to defend the body against harmful pathogens like bacteria, viruses, and fungi. It plays a crucial role in maintaining health by identifying and neutralizing foreign invaders.
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5 Must Know Facts For Your Next Test
- The immune system can be divided into innate (nonspecific) immunity and adaptive (specific) immunity.
- Innate immunity includes physical barriers like skin and mucous membranes as well as immune cells such as macrophages and neutrophils.
- Adaptive immunity involves lymphocytes, including T-cells and B-cells, which provide targeted responses to specific pathogens.
- Vaccinations help the immune system recognize and fight specific infections by mimicking a natural infection.
- Autoimmune diseases occur when the immune system mistakenly attacks the body's own tissues.
Review Questions
- What are the primary differences between innate and adaptive immunity?
- How do vaccinations contribute to the effectiveness of the immune system?
- What role do T-cells and B-cells play in adaptive immunity?
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