the water goes into the cell. distilled water outside, into it. pushes out cytoplasm. causes cytolysis, cell bursting in animals.
outside there is less solute
water goes out of cell. salt water outside, water leaves cell to meet equilibrium and because of natural diffusion/osmosis. small cytoplasm
outside there is more solute
cell loses water and shrinks
solutions are equal in concentrations.
amnt of salt solution in humans
red blood cell bursting
the movement of substances within the body in body fluids
circulation at the cell level
at the organism level ... these are examples of arteries veins and capillaries in animals. In plants, xylem and phoem.
within ONE cell
materials pass through cell membranes
made of double layer of lipids
called fluid mosaic model
real def: a random process in which the net from a region of higher concentration to a region of lower concentration until equilibrium is reached.
if a substance cannot dissolve in H2O it usually cannot pass through membranes (too big)
this is the issue that makes diffusion go faster, by a bigger difference, then a faster rate.
does diffusion need a membrane?
can molecules diffuse through gas?
the diffusion of water through a semi-permeable membrane (obv from high to low conc)
mixture of 2 or more substances where the molecules are evenly distributed: uniformly distributed mixture
these are not cloudy... clear, can be colored
water is the universal...
does the dissolving
sugar, salt, koolaid powder
movement of materials whereby no energy is expended (required) by the cell. it is automatic. high-low (diffusion)
movement of materials requiring energy. expenditure by the cell (mitochondria)
this is low to high conc
moving substances against the concentration gradient
The cytoskeleton filaments with the smallest diameter. are composed of the contractile protein actin. They are dynamic filaments, constantly beig made and broken down as needed, and are responsible for events such as pseudopod formation and cytokenesis during mitosis.
straight, hollow tubes composed of globular proteins called tubulins
in folding or taking in (pino+phago)
large particles leave the cell
large molecules cant get it, makes an indention for it. then a vacuole forms around the molecules. its active transport
large insoluble molecules can't get it. the cytoplasm streams outward to form pseudopods, these engulf the molecules. the food vacuoles then form. the lysosomes then digest the food.
has pores but is NOT selectively permeable because it is not living like the membrane is
makes plant cells rigid, because water is pressing against cell wall from the inside
excretory systems, urniary system, sweating, exhaling, these are all to ______ _______
contractile vacuoles, to pump out excess water. to _____ _____