the state of having no protection from something harmful

proteins that protect you when an unwanted substance enters your body

When microorganisms, such as bacteria or viruses, enter the body, neutrophils are one of the first immune cells to respond

manage to continue or exist in spite of difficult circumstances

Known as the “powerhouses of the cell” mitochondria produce the energy necessary for the cell's survival and functioning

A type of white blood cell that surrounds and kills microorganisms, removes dead cells, and stimulates the action of other immune system cells.