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21 Cards in this Set
- Front
- Back
diffusion
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process by which particles tend to move from areas of high concentration to areas of low concentration
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facilitated diffusion
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process of diffusion in which molecules pass across the membrane through cell membrane channels
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Aquaporin
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water channel protein in a cell
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osmosis
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diffusion of water through a selectively permeable membrane
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isotonic
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when the concentration of two solutions is the same
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hypertonic
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when comparing two solutions, the solution with the greater concentration of solutes
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hypotonic
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when comparing two solutions, the solution with the lesser concentration of solutes
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osmotic pressure
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pressure that must be applied to prevent osmotic movement across a selectively permeable membrane
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homeostasis
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relatively constant internal physical and chemical conditions that organisms maintain
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tissue
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a group of similar cells that perform a particular function
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organ
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group of tissues that work together to perform closely related functions
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organ system
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group of organs that work together to perform a specific function
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receptor
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on or in a cell, a specific protein to whose shape fits that of a specific molecular messenger, such as a hormone
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active transport
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a movement of materials against a concentration difference.
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Which type of transport requires energy?
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active transport, passive transport
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molecular transport
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small molecules and ions are carried across membranes by proteins in the membrane that act like pumps
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Bulk Transport
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larger molecules and even solid clumps of material can be transported by movements of the cell membrane
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endocytosis
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the process of taking material into the cell by means of infoldings, or pockets of the cell membrane
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exocytosis
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many cells release large amounts of material
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passive transport
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regulating the movement of molecules from side of the membrane to another in order to keep the cells internal condition relatively constant
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osmotic pressure
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The force produced when the net movement of water out of or into the cell drives differences in solute concentration.
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