Helmet, bicycle
A well-known but often neglected device designed to protect the head of a bicyclist.
Helmets decrease the risk of head injuries (traumatic brain damage) by about 85%. Unfortunately, only about 18% of bicyclists in the US use helmets all or most of the time. Universal helmet use could prevent an average of 500 bicycle-related deaths each year in the US alone.
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Flukes live in different locations in the body, including the intestines, bladder, rectum, liver, spleen, lungs and veins. Flukes first mature inside freshwater snails. After leaving the snails, they can enter the body of humans by penetrating the skin of persons swimming, bathing or washing in water where flukes are active. Infected persons can re-contaminate […]
- Helminthphobia
An abnormal and persistent fear of being infested with parasitic worms called helminths. The eggs of these worms can contaminate air and water, particularly where hygiene is poor. They can also contaminate foods such as pork and beef as well as pets and wild animals, objects such as toilet seats, and feces (bowel waste). Pinworms, […]
- 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 […]
- 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.