movement in and out of cells - key terms Flashcards
1
Q
Define diffusion
A
Net movement of particles down the concentration gradient (high → low) as a result of their random movement.
2
Q
Define osmosis
A
Net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution) through a partially permeable membrane.
3
Q
Define active transport
A
Movement of particles through a cell membrane from a lower concentration region to a higher concentration region (i.e., against a concentration gradient), using energy from respiration.