Osmosis - Definition and Examples - Biology Dictionary
2020年10月1日 · Osmosis is when a substance crosses a semipermeable membrane in order to balance the concentrations of another substance. In biology, this is usually when a solvent such as water flows into or out of a cell depending on the concentration of a solute such as salt. Osmosis happens spontaneously and without any energy on the part of the cell.
Physiology, Osmosis - StatPearls - NCBI Bookshelf
2023年3月13日 · In physiology, osmosis (Greek for push) is the net movement of water across a semipermeable membrane (see Figure. Osmosis).[1][2] Across this membrane, water will tend to move from an area of high concentration to an area of low concentration.
2.1: Osmosis - Biology LibreTexts
2023年10月11日 · If a cell has a cell wall, the wall helps maintain the cell’s water balance. Osmotic pressure is the main cause of support in many plants. When a plant cell is in a hypotonic environment, the osmotic entry of water raises the turgor pressure exerted against the cell wall until the pressure prevents more water from coming into the cell.
Osmosis – Definition, Types, Mechanism, Significance, Examples
2024年10月30日 · Osmosis in Animal Cells: When animal cells are exposed to a hypertonic solution—where the concentration of solute is higher outside the cell—water exits the cells. This leads to a phenomenon known as crenation, where the cells shrink due to water loss. For example, red blood cells (RBCs) will shrink in size when placed in diluted blood plasma.
Osmosis - Transport in cells - AQA - GCSE Combined Science …
For an organism to function, substances must move into and out of cells. Three processes contribute to this movement - diffusion, osmosis and active transport. osmosis The movement of water...
Khan Academy
Learn about osmosis, a vital process in cellular function, including mechanisms of transport, tonicity, and osmoregulation.
17.3: Osmosis - Biology LibreTexts
2022年5月27日 · Osmosis is the diffusion of water across membranes from low to high solute concentrations, an essential cellular activity. It allows cells to use water to maintain cellular integrity or to adapt to changes in the solute composition in the extracellular environment. Osmosis relies on the transport of water by aquaporins. The passive diffusion of ...
Osmosis | Definition, Examples, & Facts | Britannica
2024年11月18日 · Osmosis, the spontaneous passage or diffusion of water or other solvents through a semipermeable membrane (one that blocks the passage of dissolved substances—i.e., solutes). The process, important in biology, was first thoroughly studied in 1877 by a German plant physiologist, Wilhelm Pfeffer.
6.5: Passive Transport - Osmosis - Biology LibreTexts
Osmosis is the diffusion of water through a semipermeable membrane according to the concentration gradient of water across the membrane. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane and the membrane limits the diffusion of solutes in the water.
Osmosis - Definition and Examples - Biology Online Dictionary
2023年8月25日 · In biology, osmosis is defined as the net movement of water molecules through a biological membrane (e.g. cell membrane) from an area of higher to an area of lower water potential. Other definitions of osmosis are as follows: In chemistry, osmosis is defined similarly.