8.3 - 8.4 Vocab Flashcards
Relatively constant internal physical and chemical conditions that organisms maintain
Homeostasis
Process by which particles tend to move from an area where they are more concentrated to an area where they are less concentrated
Diffusion
Process of diffusion in which molecules pass across the membrane through cell membrane channels
Facilitated diffusion
Water channel protein in a cell
Aquaporin
Diffusion of water through a selectively permeable membrane
Osmosis
When the concentration of two solutions is the same
Isotonic
When comparing to solutions the solution with the greater concentration of solutes
Hypertonic
When comparing to solutions the solution with the lesser concentration of solutes
Hypotonic
Pressure that must be applied to prevent osmotic movement across a selectively permeable membrane
Osmotic pressure
Group of similar cells that perform a particular function
Tissue
Group of tissues that work together to perform closely related functions
Organ
Group of organs that work together to perform a specific function
Organ system
On or in a cell, a specific protein to whose shape fits that of a specific molecular Messenger such as a hormone
Receptor
