Artificial pancreas
Artificial pancreas: A machine that constantly measures glucose (sugar) in the blood and, in response to an elevated level of glucose, releases an appropriate amount of insulin. In this respect, an artificial pancreas functions like a natural pancreas.
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Aquaporin: A water channel. Aquaporins form pores in the membranes of cells and selectively conduct water molecules through the membrane, while preventing the passage of ions (such as sodium and potassium) and other small molecules. Aquaporins are typically composed of identical subunit proteins. Water molecules traverse the narrowest portion of the water channel in single […]
- Aquaphobia
Aquaphobia: An abnormal and persistent fear of water. Sufferers from aquaphobia experience anxiety even though they realize the water in an ocean, a river, a lake, a creek or even a bathtub may pose no imminent threat. They generally avoid such activities as boating and swimming. Around the house, they may fear the water in […]
- Ascariasis
Ascariasis: Infection with Ascaris lubricoides, the intestinal roundworm, the most common worm infection in humans. Ascaris eggs are found in the soil. Infection occurs when a person accidently ingests (swallows) infective ascaris eggs. Once in the stomach, larvae (immature worms) hatch from the eggs. The larvae are carried through the lungs then to the throat […]
- Ascaris
Ascaris: Intestinal roundworms. Infection with ascaris is referred to as ascariasis.
- Ascending aorta
Ascending aorta: The first section of the aorta, which starts from the left ventricle of the heart and extends to the aortic arch. The right and left coronary arteries that supply blood to the heart muscle arise from the ascending aorta.