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Growth, Development, and Reproduction of Organisms: Human Body Systems
Immune System
Description
Immune System
The immune system is the body’s defense network that protects against harmful invaders such as bacteria, viruses, fungi, and parasites. It includes specialized cells, tissues, and organs like white blood cells, the lymph nodes, spleen, and bone marrow. The immune s...
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Transcript
Have you ever wondered why you don’t get sick every time you touch something dirty? That’s because your immune system jumps into action immediately, blocking most germs before they can cause harm.
Your first line of defense is your skin—it blocks most germs from getting in. Inside your nose and mouth, sticky mucus traps germs, and tiny hai...
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