HPP LEC Chap 3 Flashcards
specialized structure
organelles
jelly-like substance that holds the organelles
Cytoplasm
the outermost component of a cell
Cell membrane
substance outside the cell
Extracellular
substance inside the cell
Intracellular
Functions of the cell
- Cell metabolism and energy use
- Synthesis of molecules
- Communication
- Reproduction and inheritance
the model used to
describe the cell membrane structure
fluid-mosaic model
does not require the cell to expend energy
Passive membrane transport
requires the cell to expend energy
Active membrane transport
involves movement of substances in a solution down a concentration gradient
Diffusion
composed of two major part, solute and solvent
Solution
substances dissolved in a predominant liquid or gas
Solute
substance that dissolve the solute
solvent
the difference in the concentration of a solute in a solvent
Concentration gradient
constantly allows ions to pass through
Leak channels
limit the movement of ions across the membrane by opening and closing
Gated channels
the diffusion of water across a selectively permeable membrane
Osmosis
the force required to prevent movement of water across cell membrane
Osmotic pressure
has a lower concentration of solute and a higher concentration of water
Hypotonic
has the same solute concentrations inside and outside the cell
Isotonic
the solution has a lower solute concentration than the surrounding solution
Hypertonic
a carrier-mediated process that moves substances across the cell membrane from regions of lower concentration
Active transport
a carrier-mediated transport process that moves substances across the cell membrane from areas of higher concentration
Facilitated diffusion
involves the active transport of one substance establishing a concentration gradient
Secondary active transport
the diffusing substance moves in the same direction as the initial active transported substance
Contransport