Podcast
Questions and Answers
What is diffusion?
What is diffusion?
What is facilitated diffusion?
What is facilitated diffusion?
What is osmosis?
What is osmosis?
What are ion pumps?
What are ion pumps?
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What is exocytosis?
What is exocytosis?
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What is pinocytosis?
What is pinocytosis?
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What is phagocytosis?
What is phagocytosis?
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What is receptor-mediated endocytosis?
What is receptor-mediated endocytosis?
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Study Notes
Active and Passive Transport
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Diffusion:
- A passive process where molecules (liquids, solutes, gases) move across a cell membrane, balancing concentrations inside and outside the cell.
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Facilitated Diffusion:
- A passive transport method that utilizes specific transport proteins to help molecules cross the cell membrane without energy expenditure.
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Osmosis:
- Passive diffusion specifically referring to the movement of water molecules across a semipermeable membrane, crucial for maintaining cellular balance.
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Ion Pumps:
- An active transport mechanism that regulates the concentration of specific ions (like Na⁺, K⁺) within a cell, functioning against the concentration gradient using energy.
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Exocytosis:
- An active process where vesicles formed from the Golgi apparatus or endoplasmic reticulum fuse with the plasma membrane, releasing their contents outside the cell.
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Pinocytosis:
- A type of active endocytosis, where the plasma membrane engulfs extracellular fluid, forming vesicles that bring fluid into the cell.
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Phagocytosis:
- An active endocytosis process involving the engulfment of solid particles by the plasma membrane, creating a vacuole for digestion.
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Receptor-Mediated Endocytosis:
- An active process where specific proteins with receptor sites interact with extracellular substances, allowing selective uptake via membrane invagination.
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Description
Explore the fundamental concepts of active and passive transport in cells with these flashcards. Learn key terms such as diffusion, facilitated diffusion, osmosis, and ion pumps to enhance your understanding of cellular processes.
