Honors Bio Ch. 5.1 Permeability & Diffusion

Terms from section 1

Homeostasis

Ability of cell to maintain balance need for life

Permeability

ability of a molecule to move across a membrane

Selectivity (semi) Permeable

permeable to some molecules & impermeable to others

Passive Transport

Movement across a membrane without using cellular energy (APT)

Concentration Gradient

difference in concentration of molecules across a membrane or space

Molecules move back and forth until…

balance is reached (Equilibrium)

When equilibrium is reached

molecules is still move but concentration does not change

simple diffusion

movement of solute molecules

osmosis

movement of solvent (water)

facilitated diffusion

transport that requires integral proteins