what do you mean by hypersensitivity ?
Hypersensitivity is an immune response that damages the body's own tissues.
Immune system
Hypersensitivity is an immune response that damages the body's own tissues.
where is the thymus gland located in the human body The thymus is located in the upper front part of the chest, in the anterior superior mediastinum, behind the sternum, and in front of the heart. what is this gland ? The thymus is a specialized primary lymphoid organ of the immune system. can it be removed ? Yes, The thymus is a specialized primary lymphoid organ of the immune system. what is its structure ? In children, the thymus is pinkish-gray, soft, and lobulated on its surfaces. At birth it is about 4–6 cm long, 2.5–5 cm wide, and about 1 cm thick. It increases in size until puberty, where it may have a size of about 40–50 g, following which it decreases in size in a process known as involution. is it present in any other animal ? Yes, The thymus is present in all jawed vertebrates what is the system you mentioned above ? The immune system is a host defense system comprising many biological structures and processes within an organism that protects against disease. what is its layered defense ? Physical barriers prevent pathogens such as bacteria and viruses from entering the organism. is it adaptive ? Yes, It evolved in early vertebrates and allows for a stronger immune response as well as immunological memory what are granulocytes? They are leukocytes that have granules in their cytoplasm. what are phagocytes ? Neutrophils and macrophages are phagocytes that travel throughout the body in pursuit of invading pathogens. how does it effect our sleep and rest ? UNANSWERABLE what is autoimmunity ? Overactive immune responses form the other end of immune dysfunction, particularly the autoimmune disorders. what is immunodeficiencies ? Immunodeficiencies occur when one or more of the components of the immune system are inactive. what are alternative adaptive immune system. ? A distinct lymphocyte-derived molecule has been discovered in primitive jawless vertebrates, such as the lamprey and hagfish. what are different types of t cells ? The killer T cell and the helper T cell. what is the first one ? Killer T cells are a sub-group of T cells that kill cells that are infected with viruses (and other pathogens), or are otherwise damaged or dysfunctional. and what is the latter ? Helper T cells regulate both the innate and adaptive immune responses and help determine which immune responses the body makes to a particular pathogen.
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Immune system [SEP] Hypersensitivity
Hypersensitivity is an immune response that damages the body's own tissues. They are divided into four classes (Type I – IV) based on the mechanisms involved and the time course of the hypersensitive reaction. Type I hypersensitivity is an immediate or anaphylactic reaction, often associated with allergy. Symptoms can range from mild discomfort to death. Type I hypersensitivity is mediated by IgE, which triggers degranulation of mast cells and basophils when cross-linked by antigen. Type II hypersensitivity occurs when antibodies bind to antigens on the patient's own cells, marking them for destruction. This is also called antibody-dependent (or cytotoxic) hypersensitivity, and is mediated by IgG and IgM antibodies.