L
- Laboratory study
- Research done in a laboratory. These studies may use test tubes or animals to find out if a drug, procedure, or treatment is likely to be useful. Laboratory studies take place before any testing is done in humans.
- Laboratory test
- A medical procedure that involves testing a sample of blood, urine, or other substance from the body. Tests can help determine a diagnosis, plan treatment, check to see if treatment is working, or monitor the disease over time.
- Lactose
- A sugar found commonly in milk and dairy products.
- Lactose intolerance
- The inability to digest or absorb lactose.
- Laparoscopy
- The insertion of a thin, lighted tube (called a laparoscope) through the abdominal wall to inspect the inside of the abdomen and remove tissue samples.
- Large intestine
- The long, tube-like organ that is connected to the small intestine at one end and the anus at the other. The large intestine has four parts: cecum, colon, rectum, and anal canal. Partly digested food moves through the cecum into the colon, where water and some nutrients and electrolytes are removed. The remaining material, solid waste called stool, moves through the colon, is stored in the rectum, and leaves the body through the anal canal and anus.
- Laxative
- A compound that increases fecal water content.
- Limbic system
- A network of brain regions involved in the regulation of the function of internal organs, emotions, and the maintenance of homeostasis.
- Lymphocyte
- A type of white blood cell. Lymphocytes have a number of roles in the immune system, including the production of antibodies and other substances that fight infection and diseases.
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