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plural: alveoli; thin and permeable air sacs found at the end of the bronchioles; functional units of the lung
the process by which air is moved into and out of the lungs; this involves the muscular movement of the diaphragm, and of the rib cage, which raises and lowers the pressure in the chest cavity; lowering pressure in the chest forces outside air into the lungs, and increasing pressure forces exhaled air out of the lungs
the process by which we get energy from the food that we eat; can be aerobic or anaerobic
occurs when oxygen is present, and it is the opposite process to that of photosynthesis; during photosynthesis, a plant uses energy to convert water and carbon dioxide to glucose; in this type of respiration, we use glucose, at a cellular level, to obtain energy; a very efficient process, begins in the cytoplasm of the cell and ends in the mitochondria, where the energy from glucose is stored in the form of ATP
occurs if oxygen is not present; less efficient, and produces a lower amount of ATP
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