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Osmolar

In biochemistry, referring to the osmolarity, the concentration of osmotically active particles in solution, which may be quantitatively expressed in osmoles of solute per liter of solution.

Osmolarity

The concentration of osmotically active particles in solution, which may be quantitatively expressed in osmoles of solute per liter of solution.

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.

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.

Oxyuris

A group of intestinal worms that includes pinworm.

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 […]

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.

Oxygenation

The addition of oxygen to any system, including the human body. Oxygenation may also refer to the process of treating a patient with oxygen, or of combining a medication or other substance with oxygen. Hyperbaric oxygenation is an increased amount of oxygen in organs and tissues resulting from the administration of oxygen in a compression […]

Oxyhemoglobin

The oxygen-loaded form of hemoglobin, the predominant protein in red blood cells. Hemoglobin is a protein molecule that binds to oxygen. Hemoglobin forms an unstable, reversible bond with oxygen. In its oxygen-loaded form, it is called oxyhemoglobin and is bright red. In the oxygen-unloaded form it is called deoxyhemoglobin and is purple-blue.

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