Immune system

Understanding Immune System Health immune system The immune system protects organisms from infection with layered defenses of increasing specificity Physical barriers prevent pathogens, such skeletal system The immune system keeps infectious microorganisms, such as bacteria, viruses, and fungi, out of the body It also destroys any infectious microorganisms that do

succubus system The immune system is made up of cells and organs that protect your body from outside invaders such as bacteria, viruses, fungi, and parasites (