Immune Cells:
* White blood cells (WBCs): These are the primary responders to invaders.
* Neutrophils: Engulf and destroy bacteria.
* Macrophages: Engulf and destroy bacteria, viruses, and cellular debris.
* Lymphocytes:
* T lymphocytes: Directly kill infected cells or stimulate other immune cells.
* B lymphocytes: Produce antibodies that target specific invaders.
* Natural Killer (NK) cells: Kill infected cells or tumor cells.
Immune Proteins:
* Antibodies: Proteins produced by B lymphocytes that bind to specific invaders, marking them for destruction.
* Cytokines: Signaling molecules that help coordinate the immune response. Some examples include:
* Interferons (IFNs): Antiviral proteins.
* Tumor necrosis factor (TNF): Plays a role in inflammation and cell death.
* Interleukins (ILs): A diverse group involved in various immune functions.
* Complement proteins: A group of proteins that work together to directly destroy invaders and attract other immune cells.
Other Substances:
* Histamine: Released by mast cells, causing inflammation and increased blood flow.
* Prostaglandins: Hormones that contribute to inflammation and pain.
* Reactive oxygen species (ROS): Molecules produced by immune cells that can damage invaders, but also potentially damage healthy cells.
Important Notes:
* This is not an exhaustive list, as the immune system is incredibly complex.
* The specific substances produced will depend on the type of invader, the individual's immune system, and other factors.
* Some of these substances can contribute to inflammation, which is a normal part of the immune response but can also cause damage if it becomes excessive.
In addition to these substances, the body may also produce other molecules like fever-inducing pyrogens or tissue-repairing factors during infection.
It's important to understand that the human body's defense system is constantly working to protect us from invaders, and the substances produced during an immune response are essential for this process.
