What is innate immune system?

The innate immune system is the body's first line of defense against infection and disease. It is made up of physical barriers, such as the skin and mucous membranes, as well as chemical barriers, such as stomach acid and saliva. The innate immune system also includes cells that can recognize and attack foreign invaders, such as bacteria and viruses.

The innate immune system is activated by a variety of triggers, including:

- The presence of foreign molecules, such as those found on the surface of bacteria and viruses

- Damage to cells or tissues

- The release of inflammatory chemicals

- The presence of cytokines, which are proteins that signal the immune system to attack

Once activated, the innate immune system can take a variety of actions to defend the body, including:

- Releasing chemicals that kill or damage foreign invaders

- Triggering inflammation, which is a process that helps to wall off infected areas and prevent the spread of infection

- Recruiting immune cells to the site of infection

- Activating the adaptive immune system, which is a more specialized form of immunity that develops over time

The innate immune system is essential for protecting the body against infection and disease. It is constantly working to defend the body, even when we are not aware of it.