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lesson 4
cells
| Term | Definition |
|---|---|
| selectively permeable | a biological barrier that carefully controls which substances can pass through it and which are blocked |
| passive transport | the movement of substances across a cell membrane that does not require the input of cellular energy |
| diffusion | a form of passive transport where small molecules move directly through the phospholipid bilayer of the cell membrane without the assistance of transport proteins. |
| osmosis | a specific type of passive transport that describes the net movement of water molecules across a selectively permeable membrane. |
| active transport | a process that moves substances across the cell membrane against their concentration gradient |
| endocytosis | process where substances like food are brought into the cell by forming a bubble like membrane-bound sac called a vesicle- REQUIRES ENERGY |
| exocytosis | the process by which a cell transports large molecules or bulk material OUT of the cell's interior |
| explain how substances move in and out of cells | passive transport or active transport |
| know the different types of membrane transport and how they work | passive transport, which requires no cellular energy, and active transport, which requires energy (usually ATP). |
| explain the difference between endocytosis and exocytosis | endocytosis brings substances INTO the cell, Exocytosis pushed them OUT of the cell. |
| explain the difference between facilitated diffusion and diffusion | facilitated diffusion requires the help of membrane proteins, simple diffusion does not need proteins |
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