Biology Chapter 7 Section 3, 4

Front 1

diffusion

Back 1

process by which particles tend to move from areas of high concentration to areas of low concentration

Front 2

facilitated diffusion

Back 2

process of diffusion in which molecules pass across the membrane through cell membrane channels

Front 3

Aquaporin

Back 3

water channel protein in a cell

Front 4

osmosis

Back 4

diffusion of water through a selectively permeable membrane

Front 5

isotonic

Back 5

when the concentration of two solutions is the same

Front 6

hypertonic

Back 6

when comparing two solutions, the solution with the greater concentration of solutes

Front 7

hypotonic

Back 7

when comparing two solutions, the solution with the lesser concentration of solutes

Front 8

osmotic pressure

Back 8

pressure that must be applied to prevent osmotic movement across a selectively permeable membrane

Front 9

homeostasis

Back 9

relatively constant internal physical and chemical conditions that organisms maintain

Front 10

tissue

Back 10

a group of similar cells that perform a particular function

Front 11

organ

Back 11

group of tissues that work together to perform closely related functions

Front 12

organ system

Back 12

group of organs that work together to perform a specific function

Front 13

receptor

Back 13

on or in a cell, a specific protein to whose shape fits that of a specific molecular messenger, such as a hormone

Front 14

active transport

Back 14

a movement of materials against a concentration difference.

Front 15

Which type of transport requires energy?

Back 15

active transport, passive transport

Front 16

molecular transport

Back 16

small molecules and ions are carried across membranes by proteins in the membrane that act like pumps

Front 17

Bulk Transport

Back 17

larger molecules and even solid clumps of material can be transported by movements of the cell membrane

Front 18

endocytosis

Back 18

the process of taking material into the cell by means of infoldings, or pockets of the cell membrane

Front 19

exocytosis

Back 19

many cells release large amounts of material

Front 20

passive transport

Back 20

regulating the movement of molecules from side of the membrane to another in order to keep the cells internal condition relatively constant

Front 21

osmotic pressure

Back 21

The force produced when the net movement of water out of or into the cell drives differences in solute concentration.