Question

Your first line of defense is your _______________________ immune system. It uses an arsenal of physical and chemical barriers, ____________________ cells, and even ___________________, to keep you healthy.

Answer 1

The body's first line of defense is the innate immune system, which includes physical and chemical barriers as well as various types of white blood cells.

Step-by-step explanation:

The body's first line of defense is the innate immune system. It consists of various physical and chemical barriers that prevent pathogens from entering the body. For example, the skin acts as a mechanical barrier, while tears, mucus, stomach acid, and friendly bacteria provide chemical barriers. Additionally, the innate immune system includes white blood cells like neutrophils, macrophages, and dendritic cells that phagocytize pathogens, and natural killer cells that destroy infected cells. The complement system is also part of the innate immune system and helps to kill pathogens.