thin, flexible barrier that surrounds all cells; regulates what enters and leaves the cell

flexible double layered sheet that make up the cell membrane and forms a barrier between the cell and its surroundings

selectively permeable

property of biological membranes that allows some substances to pass across it while together cannot; also called semipermeable membrane

relatively constant internal physical and chemical conditions that organisms maintain

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 the cell membrane channels

diffusion of water through a selectively permeable membrane

when the concentration of 2 solutions is the same

when comparing 2 solutions; the solution with the greater concentration of solutes

when comparing 2 solutions, the solution with the lesser concentration of solutes

pressure that must be applied to prevent osmotic movement across a selectively permeable membrane

on or in a cell, a specific protein to whose shape fits that of a specific molecular messenger, such as a hormone

group of organs that work together to preform a specific function

group of tissues that work together to preform closely related functions

group of similar cells that preform a particular function

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CH 8

Lesson 3

Term	Definition
Cell Membrane	thin, flexible barrier that surrounds all cells; regulates what enters and leaves the cell
Lipid Bilayer	flexible double layered sheet that make up the cell membrane and forms a barrier between the cell and its surroundings
selectively permeable	property of biological membranes that allows some substances to pass across it while together cannot; also called semipermeable membrane
Homeostasis	relatively constant internal physical and chemical conditions that organisms maintain
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 the cell membrane channels
osmosis	diffusion of water through a selectively permeable membrane
isotonic	when the concentration of 2 solutions is the same
hypertonic	when comparing 2 solutions; the solution with the greater concentration of solutes
hypotonic	when comparing 2 solutions, the solution with the lesser concentration of solutes
osmotic pressure	pressure that must be applied to prevent osmotic movement across a selectively permeable membrane
receptor	on or in a cell, a specific protein to whose shape fits that of a specific molecular messenger, such as a hormone
organ system	group of organs that work together to preform a specific function
organ	group of tissues that work together to preform closely related functions
tissue	group of similar cells that preform a particular function

Created by: callpey

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