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Lesson 11

Cell Membrane and Its Functions

TermDefinition
Cell Membrane a protective boundary that surrounds a cell
Selectively Permeable Membrane a membrane that will allow some substances to pass through it but not others
Phospholipid molecules made of two parts, one part dissolves well in water (polar end) and the other part does not dissolve well in water (non-polar end). It is a component of the cell membrane
ATP also known as adenosine triphosphate, essential for energy in organisms, when this chemical is broken down, it gives off energy. When this chemical is assembled, it can store energy
ADP also known as adenosine diphosphate, contains only two phosphate bonds, it is what ATP turns into when it loses one phosphate bond
Active Transport an energy-requiring process that moves material across a cell membrane
Passive Transport movement of materials across a membrane in which no energy is required. Diffusion and osmosis are specific types of passive transport
Diffusion the movement of molecules from an area of high concentration to an area of low concentration
Osmosis the diffusion or movement of water across a membrane from a higher concentration to a lower concentration; because no energy is required, it is considered passive transport
Osmotic Pressure the difference in pressure between areas of high and low concentration of solutes separated by a permeable membrane
Endocytosis the process by which a cell brings material into itself using the cell membrane. The cell membrane makes pockets or folds around the desired material. This material may include large molecules, clumps of food, and even whole cells
Exocytosis the process by which a cell removes large molecules from itself
Created by: ecotteacher
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