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   The act or process of breathing. The process by which a living organism or cell takes in oxygen from the air or water and uses it.


The process of respiration, during which air is inhaled into the lungs through the mouth or nose due to muscle contraction, and then exhaled due to muscle relaxation.

A living thing, such as an animal, a plant, a bacterium, or a fungus.

Fundamental structural unit of all life. The cell consists primarily of an outer plasma membrane, which separates it from the environment; the genetic material (DNA), which encodes heritable information for the maintainance of life; and the cytoplasm, a heterogeneous assemblage of ions, molecules, and fluid.

A chemical element essential for sustaining life.


A device to protect the wearer from inhalation of harmful contaminants, classified by the amount of face coverage it provides and its method of protection, e.g. a half-face, negative-pressure, air-purifying respirator; or a full-face, pressure demand, supplied air respirator.

Respiratory burst
Oxygen dependent increase in metabolic activity within phagocytic cells stimulated by bacteria or parasites, to be microbicidal.

Respiratory distress syndrome
Common in premature infants, RDS means a baby can't take in enough oxygen because his or her lungs aren't yet fully developed. With proper treatment, about 80 percent of babies recover fully.

Respiratory system
The group of organs responsible for carrying oxygen from the air to the bloodstream and for expelling carbon dioxide.

Respondent conditioning
Elicitation of a response by a stimulus that normally does not elicit that response. The response is one that is mediated primarily by the autonomic nervous system (such as salivation or a change in heart rate). A previously neutral stimulus is repeatedly presented just before an unconditioned stimulus that normally elicits that response. When the response subsequently occurs in the presence of the previously neutral stimulus, it is called a conditioned response, and the previously neutral stimulus, a conditioned stimulus.

Resporal is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): dexbrompheniramine maleate; pseudoephedrine sulfate.


The return of a disease after its apparent resolution.

Rapid eye movement. The phase of sleep associated with dreaming and distinguished from the other stages of sleep by rapid movement of the eyes.

Anything that cures.

Improvement of the symptoms of a disease.

A medical term used to describe a source of organisms causing a disease.


Delay or halt of any process such as mental or physical development.

Degeneration of the retina.

Behind the eyeball.

A virus that produces DNA from RNA (the opposite of the normal order). A group of viruses that includes HIV.

Rh factor
One of the antigens present on red blood cells. Used in categorizing the type of blood a person has.

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