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Respiration

Respiration. The process whereby the cells (q.v.) of an organism absorb oxygen during growth and maintenance that results principally in the formation of carbon dioxide (q.v.) and water (q.v.) within the cells as oxidation products, plus energy in the form of heat. Thus, yeast (q.v.), when given free access to atmospheric oxygen in a suitable growth medium, produces much more carbon dioxide and far less alcohol (q.v.) than it does during dough fermentation (q.v.) where the access to oxygen is more or less severely restricted.