Category: P

A drug used in the treatment of tuberculosis. It is administered by mouth, usually together with other anti-tuberculosis drugs; side-effects may include loss of appetite and digestive upsets.  

An anesthetic that is injected to give rapid complete anesthesia for a short period of time, for use in minor surgical operations. Side-effects may include digestive upsets, abnormal muscle movements, and a fall in blood pressure.  

The first kidney tissue that develops in the embryo. It is not functional and soon disappears. The earliest and simplest type of excretory organ of vertebrates, functional in simpler forms (cyclostomes), and serving as a provisional kidney in some fishes and amphibians. In reptiles, birds, and mammals, it appears in the embryo as a temporary,…

One of the series of cells that gives rise to the granulocytes (a type of white blood cell). It has abundant cytoplasm that, with Romanovsky stains, appears blue with reddish granules (compare myeloblast, myelocyte). Promyelocytes are normally found in the blood-forming tissue of the bone marrow but may appear in the blood in a variety…

A technique used in behavior modification to elicit a response not previously present. The subject is made to engage passively in the required behavior by instructions or by being physically put through the movements. The behavior can then be rewarded. This is followed by fading, in which the prompting is gradually withdrawn and the reinforcement…

An immature cell, found in the bone marrow, that develops into a megakaryocyte. A cell from which a megakaryocyte develops.  

A major tranquilizer used to relieve agitation, confusion, severe pain, anxiety, nausea, and vomiting and in the treatment of alcoholism and drug withdrawal symptoms. It is administered by mouth or injection; common side-effects are drowsiness and dizziness. A medication of the phenothiazine class, commonly used as a sedative, may have side effects such as unusual…

One of the segments of a tapeworm. Mature segments, situated at the posterior end of the worm, each consist mainly of a branched uterus packed with eggs.  

The earliest recognizable precursor of the red blood cell (erythrocyte). It is found in the bone marrow and has a large nucleus and a cytoplasm that stains deep blue with Romanovsky stains.  

The site of the embryonic anus, marked by a depression lined with ectoderm. The membrane separating it from the hindgut breaks down in the third month of gestation. An ectodermal depression located caudally that, upon rupture of the cloacal membrane, forms the anal canal.