Thin, a flexible barrier that surrounds all cells , regulates what enters and leaves the cell.

Flexible double- layered sheet that makes up all cell membrane and forms a barrier between the cell and its surroundings.

Selectively permeable

Property of biological membranes that allows some substance to pass across it while others cannot, all 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 less concentrated.

Facilitated Diffusion

Process of diffusion in which molecules pass across the membrane through cell membrane channels.

Diffusion of water through a selectively permeable membrane.

When the concentration of two solutions is the same.

When comparing two solutions, the solution with the greater concentration of solutes.

When comparing two solutions, the solutions 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.

groups of organs that work together to perform a specific function.

Groups of tissues that work together to perform closely related functions.

Groups of similar cells that perform a particular function.

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vocab 8.3 science

Term	Definition
cell Membrane	Thin, a flexible barrier that surrounds all cells , regulates what enters and leaves the cell.
Lipid Bilayer	Flexible double- layered sheet that makes up all cell membrane and forms a barrier between the cell and its surroundings.
Selectively permeable	Property of biological membranes that allows some substance to pass across it while others cannot, all 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 less concentrated.
Facilitated Diffusion	Process of diffusion in which molecules pass across the membrane through cell membrane channels.
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 solutions 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	groups of organs that work together to perform a specific function.
Organ	Groups of tissues that work together to perform closely related functions.
Tissue	Groups of similar cells that perform a particular function.

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