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.
What is Diffusion and Osmosis? February 6, 2011, Jodel X, Leave a comment. What is Diffusion and Osmosis? What is diffusion and osmosis? In biology, both terms pertains to a type of passive transport. Passive transport means that the molecules moving in and out of the cell do not require energy to be in motion.