click below
click below
Normal Size Small Size show me how
biology 3
Term | Definition |
---|---|
diffusion | process by which particles tend to move from an area where they are more concentrated to an area where they are less concentrated |
facilitated diffusion | process of diffusion in which molecules pass across the membrane through cell membrane channels |
aquaporin | water channel in a protein cell |
osmosis | diffusion of water through a selectively permeable membrane |
isotonic | when the concentration of two solutions is the same |
hypertonic | when comparing two solutions, the solution with the greater concentration of solutes |
hypotonic | when comparing two solutions, the solution with lesser concentration of solutes |
osmotic pressure | pressure that must be applied to prevent osmotic movement across a selectively permeable membrane |
homeostasis | relatively constant internal physical and chemical conditions that organisms maintain |
tissue | A group of similar cells that perform a particular function |
organ | group of tissues that work together to perform closely related functions |
organ system | group of organs that work together to perform a specific function |
receptor | on or in a cell, a specific protein whose shape fits that of a specific molecular messenger, such as a hormone |