Please enable JavaScript.
Coggle requires JavaScript to display documents.
Topic 2d Key Words - Coggle Diagram
Topic 2d Key Words
-
Methods of Transport
-
Osmosis
Movement of water molecules from a dilute solution to a more concentrated solution across a partially permeable membrane
Active Transport
Movement of particles from a lower concentration to a higher concentration (against a concentration gradient)
-
Works by using carrier proteins, which are embedded in the cell membrane to pick up specific molecules and take them through the cell membrane against the concentration gradient
Osmosis in Cells
Plant Cells
In a dilute solution (higher water potential than the cell contents),
water enters the cell by osmosis. The cytoplasm pushes against the cell wall and the cell becomes turgid.
In a concentrated solution (lower water potential than the cell contents), water leaves the cell by osmosis. The cytoplasm pulls away from the cell wall (plasmolysis) and the cell becomes flaccid and the plant wilts.
Animal Cells
In a dilute solution (higher water potential than the cell contents),
gain water, the cell swells and bursts (haemolysis)
In a concentrated solution (lower water potential than the cell contents), the cell loses water and shrinks (it becomes crenated or wrinkled)