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CELL TRANSPORTATION

Author: Syd Hilder
Across
No energy is required by the cell to move molecules across its membrane.
When animal cells have collapsed due to water loss.
The cell membrane controls the movement of substances into and out of the cell allowing smaller molecules through, but stopping larger ones.
The concentration of solutes is the same inside and outside the cell.
The solution has a lower solute concentration than the cell.
When plant cells have lost water due to osmosis.
Release of cellular substances as secretions from cells in membrane vesicles.
This substance is free to move across the cell membrane unrestricted.
The thin skin surrounding the cytoplasm of every cells.
Cell drinking.
A force driven by differences in solute concentrations that causes the net movement of water out of or into a cell.
Down
The passive movement of particles from a region of high concentration to a region of low concentration, down a concentration gradient or slope, over short distances.
Cells that contain water channel proteins that allow water to pass right through them.
When plant cells are swollen with water.
The cell membrane controls the movement of certain biomolecules allowing then to cross at certain "gates"; the cell uses energy to do this.
Incorporation of substances into a cell by phagocytosis or pinocytosis.
Energy from cells is needed to move particles against a concentration gradient across its membrane.
Cell eating.
The passive movement of particles from a region of high concentration to a region of low concentration down a concentration gradient.
Lipids found in all living cells and in the bilayers of cell membranes.
The movement of water molecules from a region of high water concentration to a region of low water concentration across a semi-permeable membrane.