Types of Cells
these cells produce highly specific Y-shaped proteins called antibodies to neutralize pathogens.
B cells
This spongy tissue found inside large bones is the primary birthplace where all immune cells are produced.
bone marrow
These microscopic, single-celled organisms lack a nucleus and can be cured using prescription antibiotics.
Bacteria
This massive organ acts as the body's primary physical barrier, blocking pathogens from entering tissues
skin
This common immune malfunction occurs when the body overreacts to harmless environmental substances like pollen or peanuts.
Allergy
These rapid first-responders are the most abundant white blood cells in the human body and primarily fight bacterial infections.
neutrophils
Located in the upper chest, this organ is where T cells travel to mature and "learn" how to distinguish self from non-self.
Thymus
These non-living entities consist only of genetic material wrapped in a protein coat and must hijack a host cell to replicate.
Viruses
This sticky fluid lines respiratory and digestive tracts to trap dust, microbes, and debris before they reach internal organs.
mucus
This broad term describes diseases like Lupus or Rheumatoid Arthritis, where the immune system mistakenly attacks the body's own healthy tissues.
autoimmune disease
Acting as a bridge between innate and adaptive immunity, these professional antigen-presenting cells engulf pathogens and present the fragments to T cells.
dendritic cells
Found in clusters along lymphatic vessels, these small, bean-shaped structures filter lymph fluid and swell up during an infection.
Lymph Nodes
Malaria is caused by Plasmodium, which belongs to this diverse group of single-celled eukaryotic organisms.
protists
This chemical barrier found in tears, saliva, and sweat breaks down the cell walls of invading bacteria.
lysozyme
In this specific condition, the immune system destroys insulin-producing beta cells in the pancreas, leading to high blood sugar.
Diabetes
Unlike cytotoxic T cells, these innate immune cells destroy virus-infected and cancerous body cells without needing prior exposure or specific antigen recognition.
Natural Killer (NK) cells
Situated in the upper left abdomen, this largest lymphatic organ filters blood, destroys old red cells, and stores a reserve of monocytes.
Spleen
This class of infectious invaders consists entirely of misfolded proteins that cause fatal brain diseases like Mad Cow disease.
prions
This localized, non-specific response causes redness, heat, swelling, and pain to bring white blood cells to an injury site.
inflammation
This severe, life-threatening allergic reaction causes a sudden drop in blood pressure and narrowed airways, requiring an immediate epinephrine injection.
anaphylaxis
These critical cells express the CD4 glycoprotein and are the primary target of HIV, leading to a severely compromised immune system when depleted.
Helper T cells
Located in the small intestine, these specialized lymphoid tissue patches analyze gut bacteria and prevent systemic infections.
Peyer's patches
Ringworm and Athlete's foot are caused by this kingdom of spore-producing organisms that thrive in warm, damp environments.
Fungi
These specialized signaling proteins are released by virus-infected cells to warn neighboring cells to block viral replication.
Interferons
This chronic autoimmune disease occurs when the immune system attacks myelin, the protective sheath covering nerve fibers in the central nervous system.
Multiple Sclerosis