Chapter 6: Membrane Transport Flashcards Preview

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Flashcards in Chapter 6: Membrane Transport Deck (16):
1

the diffusion of water across a selectively permeable membrane in response to concentration gradients

osmosis

2

-water enters by osmosis and the cell swells
-solution contains less solutes than the cell

hypotonic

3

-water leaves by osmosis and the cell shrinks
-solution contains more solutes than the cell

hypertonic

4

the concentrations of solutes than the cell inside and outside the cell are balanced

isotonic

5

-strong walls prevent plant cells from bursting
-pushes cells tightly against their walls and supports soft tissues

turgor pressure

6

plant cells shrink so much that they retract from their walls

plasmolysis

7

-transport of substances across a membrane against a concentration gradient requires this
-a process that requires energy input

active transport

8

active transport of ions contributes to an electrical potential difference across the plasma membrane

membrane potential

9

the protein that transports a substance also hydrolyzes ATP to power the transport directly

primary active transport

10

transport is indirectly driven by ATP hydrolysis

secondary active transport

11

generate membrane potential, and regulate pH in lysosomes and vacuoles

H+ pumps

12

moves Ca2+ from the cytoplasm to the cell exterior, and from the cytosol into the vesicle of the endoplasmic reticulum

Ca2+ pump

13

the plasma membrane of all animal cells moves 3 Na+ out of the cell and 2 K+ into the cell in the same pumping cycle

Na+/K+ pump

14

-the differences in concentration of ions and in electrical charge on the two sides of the membrane
-a form of potential energy

electrochemical gradient

15

the solutes moves through the membrane channel in the same direction as the driving ion

symport

16

the solute and driving ion move through the membrane channel in opposite directions

antiport