Cell Transport
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Phospholipid bilayer | Forms a boundary between the cell and it's external environment. Made of two layers of lipids with the hydrophobic tails towards the inside.
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| Homeostasis | Maintenance of constant internal conditions in an organism.
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| Permeable | Allows materials to cross the cell membrane.
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| Semipermeable | Allows some, but not all, materials to cross the cell membrane.
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| Protein | Structures that are embedded in the cell membrane. Can be used as pores or pumps to let molecules into and out of the cell.
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| Active transport | Drives molecules across a membrane from a region of lower concentration to a region of higher concentration.
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| Against concentration gradient | The way molecules move during active transport.
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| Endocytosis | The process of taking liquids or fairly large molecules into the cell by engulfing them in a membrane.
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| Exocytosis | The release of substances out of a cell by the fusion of a vesicle with the membrane.
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| Energy | ATP. Needed for active transport.
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| Pump | Used during active transport to allow molecules against a concentration gradient.
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| Passive transport | The movement of molecules across a cell membrane without energy input from the cell.
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| Diffusion | The movement of molecules in a fluid or gas from a region of high concentration to a region of lower concentration.
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| Osmosis | The movement of water from lower concentration of solutes to an area of higher concentration solutes through a membrane.
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| Isotonic | The solution has an equal concentration of dissolved particles as the cell. Water moves across the membrane at the same rate.
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| Hypertonic | Solution has a higher concentration of dissolved particles as the cell so the water flows out of the cell.
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| Hypotonic | Solution has a lower concentration of dissolved particles as the cell so the water flows into the cell.
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| Facilitated diffusion | Diffusion of molecules across a membrane through transport proteins.
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| With Concentration Gradient | The way molecules move during passive transport.
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| High to low | The way molecules move during passive transport.
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| Solute | A substance that dissolves into a solvent.
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| Solvent | The substance that is present in the greater amount that dissolves another substance.
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| Equilibrium | The condition of a system in which competing influences are balanced, resulting in no net change
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| Homeostasis | The maintenance of constant internal conditions in an organism.
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