The immune system is like our body's
defense team, protecting us from germs and diseases. It consists of different
parts, including white blood cells, antibodies, and organs like the spleen and
thymus. When germs enter our body, the immune system recognizes them as
invaders and springs into action. White blood cells attack the germs and help
us get better when we are sick. Vaccines help train our immune system to fight
off specific germs without getting sick. Keeping our immune system strong
through a healthy diet and exercise is important for staying healthy!