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Respiratory acidosis

a decrease in pH of blood, ECF and CSF, due to hypoventilation and accumulation of hydrogen ions and carbon dioxide


Respiratory alkalosis

an increase in pH of blood, ECF and CSF, due to hyperventilation and loss of hydrogen ions and carbon dioxide


Respiratory rate

the number of breaths in one minute


Respiratory tract

the conducting pathway of air in and out of the body, from the nose to the pulmonary alveoli


Rhythmic segmentation

muscular contractions which break up and mix the food within the gastro-intestinal tract. These movements do not push the food along the tract.

Ribosome

cellular organelle that is the site of protein synthesis


Rickets

abnormal ossification during growth due to a deficiency of vitamin D


Rickettsia

A micro-organism that requires other cells for growth but which uses oxygen and possesses a cell wall


Rough endoplasmic reticulum

system of membrane-bound tubes and sacs containing ribosomes that functions in the synthesis of proteins


Ruminant

animal in which the stomach is multi-chambered, the largest chamber of which is the rumen



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