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    A mineral in the body that works with protein to make hemoglobin, essential for the blood.


An inorganic compound needed by the body for good health, proper metabolic functioning, and disease prevention. Examples are calcium, magnesium, and iron.

Any of a group of complex organic compounds which contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur, the characteristic element being nitrogen. Proteins, the principal constituents of the protoplasm of all cells, are of high molecular weight and consist essentially of combinations of a-amino acids in peptide linkages. Twenty different amino acids are commonly found in proteins, and each protein has a unique genetically defined amino acid sequence which determines its specific shape and function. Their roles include enzymatic catalysis, transport and storage, coordinated motion, nerve impulse generation and many others.

Hemoglobin is a substance contained within the red blood cells and is responsible for their color. It has the unique property of combining reversibly with oxygen and is the medium by which oxygen is transported within the body. It takes up oxygen as blood passes through the lungs and releases it as blood passes through the tissues.

1. Something that cannot be done without. 2. Required in the diet, because the body cannot make it. As in an essential amino acid or an essential fatty acid. 3. Idiopathic. As in essential hypertension.

The life-maintaining fluid which is made up of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets; blood circulates through the body's heart, arteries, veins, and capillaries; it carries away waste matter and carbon dioxide, and brings nourishment, electrolytes, hormones, vitamins, antibodies, heat, and oxygen to the tissues.



Intrapartal care
Care for a pregnant woman through labor.

Intrauterine device
A small engineered piece of plastic or metal placed in a woman's uterus to prevent fertilization.

Intrauterine growth retardation
Slow growth of a fetus in the womb possibly resulting in a low birth weight baby.

Intraventricular hemorrhage
Bleeding into the ventricles or the brain, common in premature infants.

Medical tests that involve gaining entry into the body via a needle, tube, or hand.


Irregular periods
Menstrual cycles that vary more than a few days in length from month to month are considered irregular. Most menstrual cycles are about four weeks long, with the normal range between 24 and 35 days.

Similar to an incubator.

Ibotenic acid
Substance used in lesion studies. Destroys cell bodies of neurons but leave axons in tact.

Iconic memory
Short-lived visual sensory memory which lasts about 500 msec. Disrupted by masking (i.e. by a bright light). Tied to anatomical coordinates.

Interocular motion display
A motion display in which the motion stimulus in each eye of the observer is ambiguous, yet perception of coherent motion is possible if the subject combines motion information from both the eyes.

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   ron / ion / irn / iro / iiron / irron / iroon / ironn / ron / i4on / i5on / iton / igon / ifon / idon / ieon / i3on / ir9n / ir0n / irpn / irln / irkn / irin / ir8n / irob / iroh / iroj / irom / iro /