7.3 -7.4 Vocb Flashcards
controls what goes in and out of a cell.
Regulation of exchange with the environment
separates the inside of the cell from the outside.
Physical Isolation
receptors allow the cell to recognize and respond to specific molecules in its environment.
Sensitivity
specialized connections between cell membranes or between membranes and extracellular materials.
Structural Support
cell membrane consists of a lipid bilayer and proteins
Fluid Mosaic Model
this transport does not require energy.
Passive Transport
requires energy (ATP)
Active Transport
is net movement of molecules from an area of
high concentration to an area of low concentration until
equilibrium is achieved.
Diffusion
the difference in concentrations of a substance across space.
Concentrated Gradient
is the diffusion of water through a selectively permeable membrane from an area of high concentration to an area of low concentration.
Osmosis
Many cells contain water channel proteins, that allow water to pass right through them
Aquaporins
The net movement of water out of or into a cell exerts a force known as
Osmotic Pressure
the shrinking of red blood cells (RBC’s).
Crenation
red blood cells swell up and the cell membrane ruptures.
Hemolysis
moves a specific ion in one
direction only.
Ion Pumps
