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AH 112: Immunity
Study materials for the immune system unit
Question | Answer |
---|---|
What is the purpose of the immune system? | to protect against infectious germs and microorganisms |
What does immunity refer to? | The body's capacity to resist invading organisms and toxins, preventing organ and tissue damage |
Name four antigens (infectious agents) | bacteria, fungi, viruses, and parasites |
What are the defense system's cells called? | leukocytes |
What is the function of leukocytes? | seek out and destroy the organism or substance that cause disease/illness |
How does the immune system transport white cells (leukocytes) to the site of infection? | through the bloodstream |
Where are leukocytes stored in the body? | in the lymphoid organs |
Name three lymphoid organs | thymus, spleen, bone marrow |
How do leukocytes circulate through the body between the organs and nodes? | lymphatic vessels and blood vessels |
What are the two basic types of leukocytes? | phagocytes and lymphocytes |
What are phagocytes? | cells that destroy invading organisms |
What are lymphocytes? | cells that allow the body to remember and recognize previous invaders and help the body destroy them |
What is a common phagocyte that primarily fights bacteria? | neutrophil |
Name the two types of lymphocytes | B lymphocytes and T lymphocytes |
What is an antigen? | a foreign substance that invades the body |
What are antibodies? | specialized proteins that lock onto specific antigens |
What produces antibodies? | B lymphocytes |
How do immunizations work? | They introduce an antigen to the body without causing illness; however, the body is able to produce antibodies that will protect against future attack of that antigen |
What are T cells responsible for? | destroying antigens that have been identified as harmful |
What is complement? | a system of proteins that assist in killing bacteria, viruses, or infected cells |
Name the three types of immunity | Innate, adaptive, and passive |
What is innate immunity? | "natural" immunity, a type of general protection that humans are born with. Includes external barriers like skin and mucous membranes. |
What is adaptive immunity? | "active" immunity. It develops throughout our lives as we are exposed to more diseases and produce more antibodies against them. |
What is passive immunity? | immunity that is borrowed from another source and is temporary, like a mother's breast milk. |
What are the four main categories of disorders of the immune system? | immunodeficiency, autoimmune, allergic, and cancers of the immune system |
What is immunodeficiency disorder? | when a part of the immune system is not present or is not working properly |
Name some immunodeficiency disorders | IgA deficiency (primary, meaning you're born with it), HIV/AIDS (acquired, meaning you get it after an infection or as a drug side-effect) |
What is autoimmune disorder? | the immune system mistakenly attacks the body's healthy organs and tissues as though they were foreign invaders |
Name some autoimmune disorders | lupus, juvenile rheumatoid arthritis |
What is allergic disorder? | the immune system overreacts to exposure to antigens in the environment (called allergens) |
Name some allergic disorders | asthma, eczema, food and seasonal allergies, dust mite allergy, bee sting allergy |
What is cancer of the immune system? | immune cells grow out of control |
What is lymphoma? | overgrowth of the lymphoid tissues, a common childhood cancer |
What is leukemia? | abnormal growth of leukocytes, the most common childhood cancer |
What is the thymus? | In fetuses and infants, it's a two-lobed mass of lymphoid tissue that's located over the base of the heart. It helps form T-lymphocytes for several months after birth, then loses function and undergoes atrophy. |
What is the spleen? | an organ that filters and removes bacteria and other foreign substances from the bloodstream. Stores blood and 20-30% of platelets. |
What is bone marrow? | vascular tissue that fills most bone cavities; contains stem cells which can develop into different types of cells. Crucial for blood cell formation and maturation. |