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6 Cards in this Set
- Front
- Back
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diffusion
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The movement of a substance from a region of its higher concentration to a region of its lower concentration down a concentration gradient.
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osmosis
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The passage of water from a region of its higher concentration to a region of its lower concentration through a partially permeable membrane.
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active transport
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Movement of a substance across a membrane from a region of its lower concentration to a region of its higher concentration against a concentration gradient. Needs energy (ATP).
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Importance of water as a solvent.
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▪ most cells contain 75% water
▪most substance move around a cell when dissolved in water. ▪many important reactions occur in water. |
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examples of diffusion
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▪oxygen from the alveoli into the blood capillaries.
▪carbon dioxide from blood capillaries into the alveoli. |
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examples of active transport
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▪Mineral salts from soil to roots.
▪Glucose from small intestine to blood plasma. |
