How can we help?

You can also find more resources in our Help Center.

29 terms

Biology Test Four - Diffusion & Osmosis

STUDY
PLAY
solute
substance that is dissolved in a solution
solvent
substance in which the solute is dissolved in a solution
diffusion
mixing of two substances by the random motion of molecules
from high concentration to low concentration
In what direction do molecules move during diffusion?
equilibrium
reached when the concentration of the solute is the same throughout a system; diffusion stops at this point
concentration gradient
the differences between the concentration of a particular molecule in one are and the concentration of the same molecule in an adjacent area
osmosis
diffusion of water across a semipermeable membrane
from high concentration of water to low concentration of water
In what direction do molecules move during osmosis?
active transport
movement of particles that requires energy
from low concentration to high concentration
In what direction do molecules move during active transport?
sodium potassium ion pump
Give an example of active transport in the body
muscle contraction
nutrient absorption
nerve pulse transmission
The sodium potassium ion pump is very important for what 3 functions of the body?
facilitated diffusion
particles diffuse across the cell membrane with the help of proteins
from high concentration to low concentration
In what direction do molecules move during facilitated diffusion?
passive transport
process of moving molecules in the cell that does NOT use energy
diffusion
osmosis
facilitated diffusion
What are the 3 different types of passive transport?
bulk transport
used to move large particles in and out of the cell
exocytosis
type of bulk transport that moves material out of the cell
vesicle
membrane bound sacks of material made by the Golgi body
endocytosis
type of bulk transport where material is brought into the cell
pinocytosis
cell membrane encloses a droplet of fluid to bring into the cell
phagocytosis
cell membrane engulfs a solid substance to bring into the cell
white blood cells
an example of phagocytosis, these cells engulf and destroy bacteria and other invaders of the body
hypertonic
a solution in which the concentration of solutes in solution is higher than the concentration of solutes in the cell
hypotonic
a solution in which the concentration of solutes in solution is lower than the concentration of solutes in the cell
isotonic
a solution in which the concentration of solutes in the solution and in the cell are equal
cell expands
What happens to a cell in a hypotonic solution?
cell stays the same
What happens to a cell in an isotonic solution?
cell shrinks
What happens to a cell in a hypertonic solution?