Oxymetholone
A synthetic male steroid hormone that is sometimes used to treat wasting in patients with HIV disease. Since it promotes large gains in body mass, it has sometimes been used illegally by bodybuilders and athletes. It has also been used in the treatment of anemia.
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- Oxytocin
A hormone made in the brain that plays a role in childbirth and lactation by causing muscles to contract in the uterus (womb) and the mammary glands in the breast. Animal studies have shown that oxytocin also has a role in pair bonding, mate-guarding, and social memory. Oxytocin is a peptide (a compound consisting of […]
- Oxyuris
A group of intestinal worms that includes pinworm.
- Ozone
A form of oxygen that consists of three atoms of oxygen, in contrast to normal atmospheric oxygen which consists of two atoms of oxygen. Ozone is an important greenhouse gas found in both the stratosphere and the troposphere. Ozone has effects beyond acting as a greenhouse gas. In the stratosphere, ozone provides a protective layer […]
- Osmole
In biochemistry, the amount of a substance that dissociates in solution to form one mole of osmotically active particles.
- Osmolarity, plasma
The osmolarity of blood plasma, which is a measure of the hydration status of the body. The plasma osmolarity is sensitive to changes in hydration status during dehydration and rehydration.