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An immune system
- is a system of biological structures and processes within an organism
- that protects against disease by identifying and killing pathogens and
- tumor cells. It detects a wide variety of agents, from viruses to
- parasitic worms, and needs to distinguish them from the organism's own
- healthy cells and tissues in order to function properly. Detection is
- complicated as pathogens can evolve rapidly, producing adaptations that
- avoid the immune system and allow the pathogens to successfully infect
- their hosts.
White blood cells
- (WBCs), or leukocytes (also spelled "leucocytes," "leuco-" being Greek
- for white), are cells of the immune system involved in defending the
- body against both infectious disease and foreign materials. Five
- different and diverse types of leukocytes exist, but they are all
- produced and derived from a multipotent cell in the bone marrow known as
- a hematopoietic stem cell. Leukocytes are found throughout the body,
- including the blood and lymphatic system.
- (Latin: abscessus) is a collection of pus (dead neutrophils) that has
- accumulated in a cavity formed by the tissue in which the pus resides on
- the basis of an infectious process (usually caused by bacteria or
- parasites) or other foreign materials (e.g., splinters, bullet wounds,
- or injecting needles). It is a defensive reaction of the tissue to
- prevent the spread of infectious materials to other parts of the body.
- is a sore on the skin or a mucous membrane, accompanied
- by the disintegration of tissue. Ulcers can result in complete loss of
- the epidermis and often portions of the dermis and even subcutaneous fat.
- An ulcer that appears on the skin is often visible as an inflamed
- tissue with an area of reddened skin. A skin ulcer is often visible in
- the event of exposure to heat or cold, irritation, or a problem with
- blood circulation. They can also be caused due to a lack of mobility,
- which causes prolonged pressure on the tissues. This stress in the blood
- circulation is transformed to a skin ulcer, commonly known as bedsores or decubitus ulcers.  Ulcers often become infected, and pus forms.
- (INN) (pronounced /ˌpærəˈsiːtəmɒl/, /ˌpærəˈsɛtəmɒl/) or acetaminophen (/əˌsiːtəˈmɪnɵfɨn/ ( listen)) (USAN) is a widely used over-the-counter analgesic (pain reliever) and antipyretic (fever reducer). It is commonly used for the relief of headaches, other minor aches and pains, and is a major ingredient in numerous cold and flu remedies. In combination with opioid analgesics,
- paracetamol can also be used in the management of more severe pain such
- as post surgical pain and providing palliative care in advanced cancer
- patients. The onset of analgesia is approximately 11 minutes after oral administration of paracetamol, and its half life is 1–4 hours.
- (INN) or 3-methylmorphine (a natural isomer of methylated morphine, the other being the semi-synthetic 6-methylmorphine) is an opiate used for its analgesic, antitussive, and antidiarrheal properties. Codeine is the second-most predominant alkaloid in opium, at up to 3 percent; it is much more prevalent in the Iranian poppy (Papaver bractreatum),
- and codeine is extracted from this species in some places although the
- below-mentioned morphine methylation process is still much more common.
- It is considered the prototype of the weak to midrange opioids.