Chapter 7 Cell Structure And Function(7-3 And 7-4)

Front 1

lipid bilayer

Back 1

double layered sheet that forms the core of nearly all cell membranes

Front 2

concentration

Back 2

the mass of solute in a given volume of solution, or mass/volume

Front 3

concentration gradient

Back 3

the difference in concentration between two solutions separated by a selectively permeable membrane

Front 4

diffusion

Back 4

process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated

Front 5

selective permeability

Back 5

property of biological membranes that allows only certain substances to pass through them

Front 6

osmosis

Back 6

diffusion of water through a selectively permeable membrane

Front 7

facilitated diffusion

Back 7

movement of specific molecules across cell membranes through protein channels

Front 8

active transport

Back 8

energy-requiring process that moves material across the cell membrane against a concentration difference (concentration gradient)

Front 9

passive transport

Back 9

movement of materials across the cell membrane that does not require energy; includes osmosis, diffusion, and facilitated diffusion

Front 10

endocytosis

Back 10

process by which the cell takes material into the cell by infolding of the cell membrane

Front 11

exocytosis

Back 11

process by which the cell releases large amounts of material through the cell membrane

Front 12

phagocytosis

Back 12

process in which extensions of the cytoplasm surround and engulf large particles and take them into the cell

Front 13

cell specialization

Back 13

separate roles for each type of cell in multicellular organisms

Front 14

tissue

Back 14

group of similar cells that perform a particular function

Front 15

organ

Back 15

group of tissues that work together to perform closely related functions

Front 16

organ system

Back 16

group of organs that work together to form a specific function