12 terms

03 Cell Transport

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Terms in this set (...)

Osmosis
diffusion of water molecules through a membrane
Diffusion
movement of substances from an area of higher concentration to an area of lower concentration
Hypertonic
higher concentration of solutes outside the cell than inside the cell, water flows out of the cell
Hypotonic
lower concentration of solutes outside the cell than inside the cell, water flows into the cell
Isotonic
concentration of a solute is equal inside and outside
Facilitated diffusion
molecules pass through a cell membrane using transport proteins
Active Transport
movement of substances through a cell membrane only by using the cell's energy (ATP)
Passive Transport
movement of substances through a cell's membrane without using the cell's energy
Villi
Projections of cell membrane that increase surface area (found in intestine)
Endocytosis
Active transport where a cell takes in large particles, such as a white blood cell consuming a bacteria.
Exocytosis
Active transport where a cell releases particles from its membrane.
Cell Membrane
Described as selectively permeable, it regulates what comes in and out of the cell