Human Bio Unit 1 Chp 2 Movement of substances into & out of cells

OBJQ

What is diffusion?

Net movement of particles (molecules or ions) from a region of higher concentration to a region of lower concentration down the concentration gradient. (no energy required)

OBJQ

What is osmosis?

Net movement of water molecules from higher water potential to lower water potential down the concentration gradient (no energy required) through a semipermeable membrane

OBJQ

What is active transport?

Movement of substances from lower concentration to higher concentration against concentration gradient (energy required) by the help of carrier protein

OBJQ

What are factors affecting rate of diffusion?

Concentration gradient (steeper = faster diffusion rate)

Surface area to volume ratio (Large surface area to volume ratio = faster diffusion rate)

Distance (Greater the distance = slower the rate of diffusion)

Temperature (Higher temperatue = higher diffusion rate

What is the basic experiement setup plan?

C O R M S

C = Change (IDV)

O = Organism

R = Repeat (at least 3 times)

M = Measure (DV)

S = Same (Controlled V)