- The immune system is the body's natural defense against disease, made up of cells, tissues, and organs that work together to protect the body from harmful invaders like viruses, bacteria, and parasites.
- The two main parts of the immune system are the innate immune system and the adaptive immune system.
- The innate immune system provides immediate, non-specific protection against a wide range of pathogens using physical barriers like skin and mucous membranes, and cells like white blood cells and natural killer cells.
- The adaptive immune system provides long-term protection against specific pathogens using cells like T cells and B cells that can recognize and remember specific pathogens for a targeted response if encountered again.
- When the immune system detects a pathogen, it triggers an immune response involving the production of antibodies and activation of immune cells to attack and destroy the invader; this can sometimes cause symptoms like inflammation or fever.
- A healthy immune system is essential for good health, but factors like poor nutrition, lack of sleep, stress, and certain medical conditions or medications can weaken it.
Parent Tip: Review the logic above to help your child master the concept of immune system worksheet.
