diffusion
net moevement of particles from a region of higher concentration area to a region of lower concentration area until it evenly spread out
what factor affect diffusion
-surface area
-concentration gradient
-distance
-temperature
how does surface area affect diffusion
-large surface area= faster diffusion
-because more space for particles to pass through
how does temperature affect diffusion
-faster diffusion
-because particles have more kinetic energy and move faster
how does concentration gradient affect diffusion
-bigger difference in conc gradient results in faster diffusion
-because particle move more quickly from high to lower conc
how does distance affect diffusion
-shorter distance results in faster diffusion
-because particle travel less distance
osmosis
net movement of water molecule from a region of higher water potential to a region of lower water potential through a partially permeable membrane
osmosis in cell
Water moves into and out of cells by osmosis
This happens through the cell membrane
plant tissue and red blood cell in a dilute solution(more water outside)
-tissue gains mass(water enters)
-becomes turgid
plant tissue and red blood cell in a concentrated solution
-tissue losses mass(water leaves)
-becomes flaccid/plasmolysed
turgor pressure
the pressure of the cell contents against the cell wall caused by water entering the cell by osmosis.
turgid
when it has taken in water by osmosis and is firm because the cell contents push against the cell wall.
flaccid
when it has lost water by osmosis and is no longer firm.
plasmolysed
when it has lost so much water that the cell membrane pulls away from the cell wall.
active transport
is the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration, using energy from respiration(ATP)
