immune system

The immune system is the body's defense mechanism against infections and diseases. It consists of various cells, tissues, and organs that work together to identify and eliminate harmful pathogens like bacteria, viruses, and parasites. Key components include white blood cells, antibodies, and lymph nodes. When the body encounters a threat, the immune system responds by attacking and destroying the invaders, while also creating memory cells to recognize and respond more quickly to future infections. A healthy immune system is crucial for overall health, as it helps protect us from illnesses and enables recovery from injuries.