Osmosis & Diffusion

The process in which particles move through a membrane from a region of low concentration to a region of high concentration is?

active transport

endocytosis and exocytosis are examples of _____ transport?

active transport

vesicles

are sacs formed from pieces of cell membrane to carry particles into and out of cells

The movement of particles from a less crowded area to a more crowded area require?

energy

hypertonic solution

has a higher solute concentration than the cell

hypotonic solution

has a lower solute concentration than the cell

isotonic solution

has the same solute concentration of the cell

Pure water has the _______ concentration of water molecules.

highest

When you mix something such as food coloring, sugar, or salt, with water you ______ the concentration of water molecules.

lower

Water is made up of particles called ______?

molecules

semipermeable

only certain substances can pass through the membrane

channels

passageways in the cell membrane that small particles can pass through by either passive or active transport

Diffusion and Osmosis are examples of _____ transport?

passive transport

osmosis

the diffusion of water through a semipermeable membrane

diffusion

the movement of particles from high density to low density

passive transport

the movement of substances across a cell membrane without the use of energy by the cell

active transport

the movement of substances across the cell membrane that requires the cell to use energy (low to high density)

endocytosis

the process by which a cell moves large particles INTO the cell

exocytosis

the process by which a cell moves large particles OUT of the cell

Explain why diffusion and osmosis are examples of passive transport.

they do not require energy to move particles from an area of high concentration to an area of low concentration

Explain why endocytosis and exocytosis are examples of active transport.

they require energy to move particles into and out of a cell from an area of low to high concentration

Why does active transport require energy?

you need energy to move particles from an area of low concentration to to an area of high concentration