Movement Across Membranes

Question 1

what are the 3 main forces that drive substances into/out of cells:

Answer 1

Chemical
electrical
electrochemical

Question 2

what are the 2 main types of membrane transport

Answer 2

Active
Passive

Question 3

Describe passive transport

Answer 3

-no ATP required
-goes with the conc grad
-facillitaed and simple diffusion

Question 4

Describe active transport

Answer 4

-require ATP
-Against conc gradient
-primary and secondary transport

Question 5

Describe primary active transport

Answer 5

-Directly uses a source of energy, commonly ATP

-Common example NAK-ATPase Pumps 3 Na out of 2 K+ into the cell

Question 6

Describe secondary active transport

Answer 6

Transport of a substance against its gradient COUPLED to the transport of an ion (usually Na+ or H+), which moves down its gradient

Uses energy from the generation of the ions electrochemical gradient (usually by primary active transport)

Example is SGLT

Question 7

larger molecules require other methods of transport such as …

Answer 7

Exocytosis
endocytosis