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Primary teeth

The first teeth which are shed and replaced by permanent teeth. The first primary tooth comes in at about 6 months of age and the 20th and last primary tooth erupts at around 2 1/2 years of age. The primary teeth are replaced beginning usually at about age 6. Also called baby teeth, milk teeth, […]

Pulmonary therapy

Exercises and treatments designed to help patients maintain and recover lung function, such as with cystic fibrosis and after surgery.Also used for COPD and asthma.

Pulmonary syndrome, Hantavirus

A severe lung condition caused by hantavirus infection. Abbreviated HPS. In 1993, HPS struck the Four Corners area (where the states of Arizona, New Mexico, Nevada, and Utah meet) with devastating, frequently fatal consequences. As the name indicates, HPS is due to a hantavirus. The HPS outbreak in Four Corners followed 2 years of more […]

Pulmonary trunk

A vessel that arises from the right ventricle of the heart, extends upward, and divides into the right and left pulmonary arteries that convey unaerated blood to the lungs. When the right ventricle contacts, the blood inside it is put under pressure and the tricuspid valve between the right atrium and ventricle closes. The only […]

PYY

A hormone concerned with hunger and the lack of hunger (satiety). Soon after eating, PYY is secreted into the blood by cells lining the lower small intestine (the ileum) and the colon. The release of PYY begins before nutrients arrive in the lower small intestine and the colon. The further release of PYY is stimulated […]

Pyuria

Pus in the urine. Pyuria is a sign of inflammation, often related to infection.

Pythagoras

(Born c. 580 B.C.E.) Greek philosopher and mathematician who promoted health through a special vegetarian diet.

Pyrosis

A technical term for what is popularly called heartburn, a burning sensation in the upper abdomen. In many languages there is a technical term such as pyrosis and a popular term for the same phenomenon. For example, pyrosis is popularly known in French as br�lure epigastrique and in Spanish as ardor de est�mago. Pyrosis is […]

Pyrophosphate arthropathy

Joint damage due to deposition of calcium pyrophosphate. Pyrophosphate arthropathy most commonly affects the knees, wrists and knuckles and tends to be symmetrical.

Pyridoxine

One of the vitamin B6 group (which also includes pyridoxal and pyridoxamine) that is transformed in the body to pyridoxal phosphate, which functions as a coenzyme, a substance that enhances the action of an enzyme and thereby helps catalyze and speed a biochemical reaction. (A number of vitamins serve as coenzymes.) The vitamin B6 group […]

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