For his 40th birthday, I had my eye on a vintage watch. It would complement his tattered sweaters and declare to the world that he is, in fact, employed. But when I mention this to him, he balks. He says that what he really wants isn't a good, but a service: a threesome with me and another woman.
Osmosis is a special type of diffusion whereby water is moved from an area of high water potential into an area of lower water potential. In principle, the same concepts applyâ¦ for osmosis as it does for diffusion. The particles travel in a concentration gradient without the use of energy.
The rate of diffusion for different substances is affected by membrane permeability. For instance, water diffuses freely across cell membranes but other molecules can not. They must be helped across the cell membrane through a process called facilitated diffusion. Osmosis is a special case of passive transport. Water diffuses across a semi-permeable membrane, which allows some molecules to pass, but not others. In osmosis, the direction of water flow is determined by solute concentration. Water diffuses from a hypotonic (low solute concentration) solution to a hypertonic (high solute concentration) solution.