Biology: Cell Transport

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What is homeostasis in cells?

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Homeostasis is the process by which a cell maintains a stable internal environment by regulating what enters and leaves the cell.

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What is passive transport?

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Passive transport is the movement of substances across a cell membrane without the use of energy, moving from an area of high concentration to an area of low concentration.

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What is active transport?

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Active transport is the movement of substances against their concentration gradient, requiring energy (ATP) to move materials from low to high concentration.

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What is exocytosis?

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Exocytosis is an active transport process where cells expel materials in vesicles that fuse with the cell membrane.

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What is endocytosis?

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Endocytosis is an active transport process where cells take in materials by engulfing them in a vesicle.

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What does 'against the concentration gradient' mean?

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It refers to the movement of molecules from an area of lower concentration to an area of higher concentration, which requires energy.

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What is the role of ATP in active transport?

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ATP provides the energy required for active transport to move substances against their concentration gradient.

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What is simple diffusion?

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Simple diffusion is the passive movement of small or nonpolar molecules across the cell membrane from an area of high concentration to an area of low concentration.

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What is facilitated diffusion?

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Facilitated diffusion is the passive transport of molecules across a membrane via protein channels, moving from high to low concentration.

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What is osmosis?

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Osmosis is the passive transport of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.