Lymphocyte
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  Lymphocyte



Lymphocyte

    White blood cell. Lymphocytes have a number of roles in the immune system, including antibody production, attacking and destroying cancer cells, and producing substances that kill cancer cells.

RELATED TERMS
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Blood
The life-maintaining fluid which is made up of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets; blood circulates through the body's heart, arteries, veins, and capillaries; it carries away waste matter and carbon dioxide, and brings nourishment, electrolytes, hormones, vitamins, antibodies, heat, and oxygen to the tissues.

Cell
Fundamental structural unit of all life. The cell consists primarily of an outer plasma membrane, which separates it from the environment; the genetic material (DNA), which encodes heritable information for the maintainance of life; and the cytoplasm, a heterogeneous assemblage of ions, molecules, and fluid.

Immune
Resistant to a particular disease.

Antibody
An infection-fighting protein molecule in blood or secretory fluids that tags, neutralizes, and helps destroy pathogenic microorganisms (eg, bacteria, viruses) or toxins. Antibodies, known generally as immunoglobulins, are made and secreted by B-lymphocytes in response to stimulation by antigens. Each specific antibody binds only to the specific antigen that stimulated its production.

Cancer
Any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream.



SIMILAR TERMS
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Lymph
Consists primarily of a clear, yellowish fluid and white blood cells. Found in the lymphatic system.

Lymph node
Any of many small, compact structures lying in groups along the course of the lymphatic vessels and producing lymphocytes.

Lymph nodes
Small glands clustered in the neck, armpits, abdomen, and groin that supply infection-fighting cells to the bloodstream and filter out bacteria and other antigens.

Lymphadenectomy
A procedure in which lymph nodes are taken from the body for purposes of diagnosing or staging cancer.

Lymphadenitis
Inflammation of the lymph nodes.

Lymphadenopathy
Any disease process affecting a lymph node or lymph nodes.

Lymphangiectasia
Dilation of the lymphatic vessels; may be congenital or acquired.

Lymphangiogram
An x-ray that uses a special dye to determine whether cancer has spread to the lymph nodes.

Lymphangitis
Inflammation of a lymph vessel.

Lymphatic system
The vessels and structures involved in carrying lymph from the tissues to the blood.

Lymphatic Vessels
Drain lymph from tissues and returns it to the blood.

Lymphazurin
Lymphazurin is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): isosulfan blue.

Lymphedema
Swelling of tissue because of the buildup of too much lymph fluid.

Lymphokine
A cytokine produced by lymphocytes.

Lymphokines
Soluble substances secreted by lymphocytes, which have a variety of effects on lymphocytes and other cell types.

Lymphoma
Cancer of the lymphoid tissues. Lymphomas are often described as being large cell or small cell types, cleaved or non-cleaved, or diffuse or nodular. The different types often have different prognoses. Lymphomas can also be referred to by the organs where they are active, such as CNS lymphomas, which are in the central nervous system, and GI lymphomas, which are in the gastrointestinal tract. The types of lymphomas most commonly associated with HIV infection are called non-Hodgkin's lymphomas or B cell lymphomas. In these types of cancers, certain cells of the lymphatic.

Lymphopenia
A reduction, relative or absolute, in the number of lymphocytes in the circulating blood.



PREVIOUS AND NEXT TERMS
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Life expectancy
The average age at which 50 percent of newborn children survive.

Lupus
Lupus is a chronic disease in which the body's immune system, instead of serving its normal protective function, forms antibodies and cells that attack healthy tissues and organs. Discoid Lupus affects the skin, causing a rash and scars, most commonly on the face and upper parts of the body.

Lustral
A commercial name for sertraline hydrochloride, an orally administered antidepressant of the selective serotonin reuptake inhibitor (SSRI) type. Sertraline is used medically mainly to treat the symptoms of depression.

Lacunae
One of many small cavities uniformly spaced along the lamellae of bones. In living bone, each lacuna contains one bone cell known as an osteocyte. Small canals (canaliculi) radiate from the lacunae and in these are small protoplasmic processes that connect with the osteoblast in other lacunae.

Lymphocyte

Lyme Disease
A bacterial disease caused by the micro-organism (spirochete) Borrelia burgdorferi. This bacterium was discovered in 1982, although the clinical disease was first described in 1977. Infection occurs after the bite of an infected tick. The incubation period is approximately 14 days. Symptoms include a large circular red rash at the bite site (50-60% of cases), malaise, fever, headache, muscle aches and swollen lymph nodes. If untreated may progress to arthritis and compromise heart function. Some symptoms and signs of Lyme disease may not appear until weeks, months, or years after a tick bite. Early Lyme disease can usually be correctly diagnosed, but a delayed response or recurrence of this disorder may be mistaken for fibromyalgia. Some experts believe that between 15% and 50% of patients referred to clinics for Lyme disease actually have fibromyalgia. Late Lyme disease can usually (but not always) be ruled out using laboratory tests that identify the spirochete that causes this tick-borne disease. If fibromyalgia patients are incorrectly diagnosed and treated for Lyme disease with prolonged courses of antibiotics, the drugs may have serious side effects.

Lou Gehrig's Disease
Motor Neurone Disease (MND) is a term used to cover a number of illnesses of the motor neurone. Amyotrophic Lateral Sclerosis (ALS), Progressive Muscular Atrophy (PMA), Progressive Bulbar Palsy (PBP) and Progressive Lateral Sclerosis (PLS) are all types of MND. MND is the term used internationally while ALS is often used in the United States (where it is also known as Lou Gehrig's disease) to cover all forms of MND. It was first described by Jean-Martin Charcot, a French neurologist, in 1869.

Legionellosis
Legionellosis is an infection caused by species of the bacterium Legionella, most notably L. pneumophila. At least 46 species and 70 serogroups have been identified. L. pneumophila, an ubiquitous aquatic organism that thrives in warm environments (32 - 45 C) causes over 90% of Legionnaires Disease in the United States.

Lorcet
Hydrocodone (chemical synonym: dihydrocodeinone; trade names: Vicodin, Anexsia, Dicodid, Hycodan, Hycomine, Lorcet, Lortab, Norco, Tussionex) is an opioid derived from either of the natural occuring opiates -- codeine or thebaine. Hydrocodone is an orally active analgesic and antitussive Schedule II narcotic which is marketed in multi-ingredient Schedule III products. The therapeutic dose of 5 mg to 10 mg is pharmacologically equivalent to 30 to 60 mg of oral codeine.

Lortab
Hydrocodone (chemical synonym: dihydrocodeinone; trade names: Vicodin, Anexsia, Dicodid, Hycodan, Hycomine, Lorcet, Lortab, Norco, Tussionex) is an opioid derived from either of the natural occuring opiates -- codeine or thebaine. Hydrocodone is an orally active analgesic and antitussive Schedule II narcotic which is marketed in multi-ingredient Schedule III products. The therapeutic dose of 5 mg to 10 mg is pharmacologically equivalent to 30 to 60 mg of oral codeine.

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