Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
Plantar warts: Warts that grow on the soles of the feet.
Plantar warts are different from most other warts. They tend to be flat and cause the buildup of callus (that has to be peeled away before the plantar wart itself can be seen. Plantar warts may attack blood vessels deep in the skin. They can...
Plaque: 1. An semi-hardened accumulation of
substances from fluids that bathe an area. Examples include
dental plaque and cholesterol plaque.
Minerals form dental
plaque around the teeth as a result of bacterial action on
food particles. Dental plaque provides an ideal environment
Plaque psoriasis: The most common form of psoriasis -- about 80% of people with psoriasis have this type. Plaque psoriasis can appear on any skin surface, although the knees, elbows, scalp, trunk and nails are the most common locations. It is characterized by well-defined patches of red raised skin....
Plaque, skin: A plaque is a broad, raised area on the skin. Because it is raised, it can be felt (palpated). By definition, a skin plaque has a greater surface than its elevation above the skin surface: it is broader than it is high....
Plasma: The liquid part of the blood and lymphatic
fluid, which makes up about half of its volume. Plasma is devoid of
cells and, unlike serum, has not clotted. Blood plasma contains
antibodies and other proteins. It is taken from donors and made into
medications for a variety of blood-related c...
Plasma cell: A type of white blood cell that produces and secretes antibodies. A plasma cell is a fully differentiated lymphocyte in the B-cell (not the T-cell) lineage.
As with most cell types, plasma cells can mutate to give rise to cancer. Plasma cell malignancies include multiple myeloma, Walden...
Plasma donation: The donation of sale of blood
plasma for use in medical or other products. Unlike blood
donors, most plasma "donors" in the US are paid. The
procedure is done in a walk-in facility, where whole blood
is taken through an IV needle, and separated into plasma
and blood cells. The ...
Plasma osmolarity: The osmolarity of blood plasma, which is a measure of the hydration status. The plasma osmolarity is sensitive to changes in hydration status during dehydration and rehydration. The normal plasma osmolarity is in the range of 280-300 mOs/kg. This may vary somewhat from laboratory ...
Plasmacytoma: Cancer of the plasma cells (white blood cells that produce antibodies) that may turn into multiple myeloma....
Plasmapheresis: A procedure designed to deplete the body of blood plasma (the liquid part of the blood) without depleting the body of its blood cells. Whole blood is removed from the body, the plasma is separated from the cells, the cells are suspended in saline, a plasma substitute or donor plasma)...
Plasmid: A circle of DNA that is self-replicating (autonomously replicating) and distinct from the normal genome of bacteria. A plasmid contains genes that as a rule are not essential
to the growth or survival of the cell. Some plasmids can integrate into the host genome, can be artificially constru...
Plasmodium: The parasite guilty in the case of malaria
(paludism). Plasmodium is a type of protozoa, a single-celled organism able to divide only within a host cell.
The main types are:
Plasmodium falciparum, the species which causes falciparum malaria, the most dangerous type of malaria;
Plastic surgeon: A surgeon who specializes in
reducing scarring or disfigurement that may occur as a result of
accidents, birth defects, or treatment for diseases, such as melanoma.
Many plastic surgeons also perform cosmetic surgery that is unrelated to medical conditions, such as rhinoplasty t...
Plastic surgery: The field of surgery concerned with reducing scarring or disfigurement that may occur as a result of accidents, birth defects, or treatment for diseases, such as melanoma.
Many plastic surgeons also perform cosmetic surgery that is unrelated to medical conditions, such as rhinopla...
Plasticity, brain: See Neuroplasticity....