Cell Transport Review Worksheet Answer Key
Cell transport is the process by which cells move materials in and out of the cell. This process is crucial for the survival of cells and is controlled by the cell membrane. In this review worksheet, we will cover the different types of cell transport, including passive transport and active transport.
Passive Transport
Passive transport is the movement of materials across the cell membrane without the use of energy. There are three types of passive transport: diffusion, osmosis, and facilitated diffusion.
Diffusion is the random movement of particles from an area of high concentration to an area of low concentration. This process helps to distribute materials evenly throughout the cell.
Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane. This process helps to regulate the amount of water in the cell.
Facilitated diffusion is the movement of materials across the cell membrane with the help of transport proteins. These proteins help to speed up the process of diffusion by providing a channel for materials to pass through.
Active Transport
Active transport is the movement of materials across the cell membrane using energy. This process is used to transport materials against their concentration gradient, from an area of low concentration to an area of high concentration.
There are two types of active transport: endocytosis and exocytosis.
Endocytosis is the process by which cells take in materials from outside the cell by engulfing them with a portion of the cell membrane.
Exocytosis is the process by which cells release materials to the outside of the cell by fusing vesicles with the cell membrane.
Types of Cell Transport
| Type of Transport | Description |
|---|---|
| Passive Transport | Movement of materials across the cell membrane without energy |
| Active Transport | Movement of materials across the cell membrane using energy |
| Diffusion | Random movement of particles from high to low concentration |
| Osmosis | Movement of water molecules from high to low concentration |
| Facilitated Diffusion | Movement of materials with the help of transport proteins |
| Endocytosis | Cell takes in materials by engulfing them with the cell membrane |
| Exocytosis | Cell releases materials by fusing vesicles with the cell membrane |
Important Notes
📝 Note: Cell transport is essential for the survival of cells and is controlled by the cell membrane.
📝 Note: Passive transport does not require energy, while active transport requires energy to move materials against their concentration gradient.
Key Concepts to Remember
- Passive transport: diffusion, osmosis, facilitated diffusion
- Active transport: endocytosis, exocytosis
- Cell membrane controls cell transport
- Energy is required for active transport, but not for passive transport
In summary, cell transport is the process by which cells move materials in and out of the cell. There are two types of cell transport: passive transport, which does not require energy, and active transport, which requires energy to move materials against their concentration gradient.
What is the main function of the cell membrane in cell transport?
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The cell membrane controls the movement of materials in and out of the cell by regulating the types of materials that can pass through it.
What is the difference between passive and active transport?
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Passive transport does not require energy, while active transport requires energy to move materials against their concentration gradient.
What is the purpose of facilitated diffusion?
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Facilitated diffusion helps to speed up the process of diffusion by providing a channel for materials to pass through the cell membrane.
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