Respiratory acidosisa decrease in pH of blood, ECF and CSF, due to hypoventilation and accumulation of hydrogen ions and carbon dioxide |
Respiratory alkalosisan increase in pH of blood, ECF and CSF, due to hyperventilation and loss of hydrogen ions and carbon dioxide |
Respiratory ratethe number of breaths in one minute |
Respiratory tractthe conducting pathway of air in and out of the body, from the nose to the pulmonary alveoli |
Rhythmic segmentationmuscular contractions which break up and mix the food within the gastro-intestinal tract. These movements do not push the food along the tract. |
Ribosomecellular organelle that is the site of protein synthesis |
Ricketsabnormal ossification during growth due to a deficiency of vitamin D |
RickettsiaA micro-organism that requires other cells for growth but which uses oxygen and possesses a cell wall |
Rough endoplasmic reticulumsystem of membrane-bound tubes and sacs containing ribosomes that functions in the synthesis of proteins |
Ruminantanimal in which the stomach is multi-chambered, the largest chamber of which is the rumen |