Examlex
Both classical and operant conditioning are forms of
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.
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