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.
Osmosis refers to the movement of water. By trying to maintain a homogeneous condition throughout the entire system the cell there by maintains homeostasis. Osmosis is the process cells use to move water molecules in and out of the cell through the cell membrane.