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Our immune system can be divided into two categories: the innate immune system and the adaptive immune system. The innate immune system refers to the immunity that you’re born with, which targets general health threats, while adaptive immunity refers to acquired immunity, which targets more specific pathogens.
Cytokines are “at the crossroads of bridging the communication between the innate and adaptive immune responses,”
Lymphocytes: These small WBCs large role in defending the body against disease. The two types of lymphocytes are B-cells, which make antibodies that attack bacteria and toxins, and T-cells, which help destroy infected or cancerous cells. Killer T-cells are a subgroup of T-cells that kill cells that are infected with viruses and other pathogens or are otherwise damaged. Helper T-cells help determine which immune responses the body makes to a particular pathogen.
Thymus: This small organ is where T-cells mature. This often-overlooked part of the immune system, which is situated beneath the breastbone (and is shaped like a thyme leaf, hence the name), can trigger or maintain the production of antibodies that can result in muscle weakness. Thymus is somewhat large in infants, grows until puberty, then starts to slowly shrink and become replaced by fat with age.
Leukocytes: These disease-fighting WBCs identify and eliminate pathogens and are the second arm of the innate immune system. A high white blood cell count is referred to as leukocytosis. The innate leukocytes include phagocytes (macrophages, neutrophils and dendritic cells), mast cells, eosinophils and basophils.
Lymph Nodes
Spleen
Bone Marrow
Lymphocytes
Thymus
Leucocytes
Chapters:
0:00 Immunity- Immune System
0:38 Types of Immune System
1:16 Innate Immunity
1:57 Adaptive Immunity
2:57 Components of Immune System
8:55 Diseases of Immune System
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