Define a Double-Blind Study and Explain Why This Procedure Is

question 153

Essay

Define a double-blind study and explain why this procedure is used in an experiment.

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Definitions:

Vein

(1) A blood vessel that carries blood from the tissues toward a chamber of the heart (compare with artery). (2) A strand of vascular tissue that is part of the network of conducting tissue in a leaf; also called a vascular bundle.

Heart

The heart is a muscular organ in most animals, including humans, which pumps blood through the blood vessels of the circulatory system, supplying oxygen and nutrients to the body while removing carbon dioxide and other wastes.

Oxygen-Rich Blood

Blood that has been oxygenated in the lungs and is being transported to cells throughout the body.

Oxygen-Poor Blood

Blood that has given up its oxygen to nourish the body's cells and now contains a higher concentration of carbon dioxide, returning to the heart and lungs for oxygenation.