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Hematopoietic stem cell
Hematopoietic stem cell A stem cell from which all red blood cells, white blood cells, and platelets develop.
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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.
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.
Platelets
Cells found in the blood.
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Hemabate
Hemabate 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): carboprost tromethamine.
Hemagglutination
The agglutination of red blood cells; may be immune as a result of specific antibody either for red blood cell antigens per se or other antigens which coat the red blood cells, or may be nonimmune as in hemagglutination caused by viruses or other microbes.
Hemagglutinin
A substance, antibody or other, that causes hemagglutination.
Hemangio
Blood vessel.
Hemangiosarcoma
Malignant tumor of a blood vessel.
Hematemesis
Vomiting blood.
Hematocrit
The volume percentage of erythrocytes in whole blood.
Hematology
The study and treatment of blood and blood-forming tissues.
Hematoma
Swelling of effused blood beneath tissue surface.
Hematuria
The presence of blood in the urine.
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Hypoglycemia
Low levels of blood sugar.
Hypoxia
Abnormal oxygen content in the organs and tissues of the body.
Hysterosalpingography
X-ray examination of the uterus and fallopian tubes that uses dye and is often performed to rule out tubal obstruction.
Hysteroscope
Visual examination of the canal of the cervix and the interior of the uterus using a viewing instrument (hysteroscope) inserted through the vagina.
Hyposensitisation
See specific allergy vaccination.
Hematopoietic stem cell
Heteroplasmy
An atypical condition characterized by the presence of more than one type of mitochondrial DNA in a single individual. Normally, each individual has only one type of mitochondrial DNA, inherited from his or her mother through the egg at fertilization. (Mitochondria from the sperm are systematically eliminated by the egg at fertilization.)
Handedness
The preference for using one hand over the other. Most people are right-handed, about 10 percent are left-handed, and others, who don't favor a hand, are ambidextrous.
Hemolytic disease of the newborn
Also called Rh disease or erythroblastosis, hemolytic disease results when a woman who is Rh-negative (meaning she does not carry the Rh protein in her blood) has a fetus who is Rh-positive and her immune system makes antibodies against the fetus's blood. The disorder is treated with a compound that prevents the woman's immune system from making antibodies.
Hemorrhoid
Caused by increased blood volume and pressure from the uterus on the veinsin the legs and pelvis, these swollen blood vessels in the anus are commonduring pregnancy. Constipation can also cause (or compound) the problem.
Hepatitis B vaccine
The vaccine against hepatitis B, a virus that affects primarily the liver. This series of three shots, given between birth and 2 weeks and at 2 and 6 months, may cause fussiness, low-grade fever,headache, and soreness at the injection site.
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