In this Article. In this Article. A solitary pulmonary nodule (SPN) is a single abnormality in the lung that is smaller than 3 cm in diameter. Generally, a pulmonary nodule must grow to at least 1 cm in diameter before it can be seen on a chest X-ray.
Osmosis is the scientific process of transferring fluid between molecules. When molecules move in and out of a cell to achieve the same concentration of something, like salt, on both sides, then osmosis is happening.
In biology, Osmosis is defined as the diffusion of water across a cell membrane. This process accounts for many functions that maintain life. In relation to blood and plant cells, blood cells placed in pure distilled water will swell and burst, while plant cells remain turgid because the cell wall prevents bursting.