Lacrimation
Shedding tears, or shedding more tears than is normal (for example, as a result of eye injury or irritation).
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- LaCrosse encephalitis
One of the main types of encephalitis caused by an arthropod-borne (carried by a mosquito, tick or another kind of arthropod) virus. The virus infects and inflames the brain. LAC encephalitis was first found in a 4-year-old in LaCrosse, Wisconsin in 1963. Since then, the virus has been identified in a number of Midwestern and […]
- Lactase
Enzyme that breaks down the milk sugar lactose into glucose and galactose. Persons with a deficiency of lactase (alactasia) in the gut can develop abdominal cramping and diarrhea after ingesting milk products.
- Lactase deficiency
Lack of the enzyme lactase in the small intestine. Lactase is needed to digest lactose, a sugar found in milk and most other dairy products and also used as an ingredient in other foods. Although most people are born with the ability to make adequate amounts of lactase, the production of lactase normally decreases with […]
- Lactate dehydrogenase
(LDH) An enzyme that catalyzes the conversion of lactate to pyruvate. This is an important step in energy production in cells. Many different types of cells in the body contain this enzyme. Some of the organs relatively rich in LDH are the heart, kidney, liver, and muscle. As cells die, their LDH is released and […]
- Lactation
The process of milk production. Human milk is secreted by the mammary glands, which are located within the fatty tissue of the breast. The hormone oxytocin is produced in response to the birth of a new baby, and it both stimulates uterine contractions and begins the lactation process. For the first few hours of nursing, […]