Helper cell
those that activate other T cells to achieve cellular inflammatory responses; and those that drive B cells to produce antibodies in the humoral immune response. These two classes of response are generally incompatible with one another and require coordination by substances called cytokines to promote one response while dampening the other.
The HIV virus attacks T-helper cells, knocking out the body’s ability to defend itself against infections.
Helper cells have CD4 markers on their surface and are also known as CD4 cells, T-4 cells, T-helper cells, and helper T cells.
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- Hem-onc
Short for Hematology-oncology.
- Hemangioma
A benign tumor formed by a collection of excess blood vessels. A hemangioma may be visible through the skin as a birthmark, known colloquially as a ‘strawberry mark.’ Most hemangiomas that occur at birth disappear after a few months or years.
- Hemangioma, capillary
A type of hemangioma (a benign tumor formed by a collection of excess blood vessels) that is composed almost entirely of tiny capillary vessels. Capillary hemangiomas may be located anywhere on the body but they are most common on the face, scalp, back, and chest. They may be evident at birth or become noticeable several […]
- Hemangioma, cavernous
A type of hemangioma composed of blood-filled ‘lakes’ and channels. A cavernous henangioma is raised and red or purplish. Small cavernous hemangiomas on the surface of the body may be removed or treated by electrocoagulation. Surgery is sometimes needed.
- Hemangioma, hepatic
A common benign tumor of the liver made up of small blood vessels. Hepatic hemangioma is the most common benign liver tumor and is 4-6 times more common in women than men (female hormones may promote its formation and growth). These tumors are usually small, a quarter inch (less than 1 cm) in diameter, cause […]