Homeostasis and Cell Transport

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What is Homeostasis?

Back

The process by which living organisms maintain a stable internal environment despite changes in external conditions.

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What is Cell Transport?

Back

The movement of substances into and out of cells, which can occur through various mechanisms such as diffusion, osmosis, and active transport.

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Define Diffusion.

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The movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached.

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What is Osmosis?

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The diffusion of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

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What is Active Transport?

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The movement of molecules against their concentration gradient, requiring energy (ATP) to occur.

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What is Facilitated Diffusion?

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The process of transporting molecules across a cell membrane via protein channels without the use of energy.

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Define Selective Permeability.

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The ability of the cell membrane to allow some substances to pass through while preventing others.

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What is Exocytosis?

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The process by which a cell expels materials in vesicles that fuse with the cell membrane.

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What is Endocytosis?

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The process by which a cell takes in materials by engulfing them in a membrane-bound vesicle.

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What is a Negative Feedback Loop?

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A control mechanism that counteracts a change in a physiological variable to maintain homeostasis.