Physiology: membrane transport

Question 1

briefly describe facilitated diffusion

Answer 1

uses carrier protein to facilitate passive diffusion

Question 2

does facilitated diffusion require energy

Answer 2

no energy, it is passive

Question 3

briefly describe osmosis

Answer 3

movement of water from high conc. to low conc., without expending energy

Question 4

briefly describe active transport

Answer 4

requires carriers protein to expend energy to allow molecule to move against its conc. gradient
2 types; primary and secondary

Question 5

briefly describe primary active transport

Answer 5

uses energy directly to move substance against conc. gradient

Question 6

give an example of primary active transport

Answer 6

Na/K/ATPase pump (used as energy source for secondary active transport)

Question 7

briefly describe secondary active transport

Answer 7

solute moves against its conc. gradient, facilitated by passive movement of ion(eg Na) down conc. gradient

Question 8

describe what a symport is in secondary active transport

Answer 8

when the solute and ion(eg Na) move in same direction

Question 9

describe what an antiport is in secondary active transport

Answer 9

when the solute and ion(eg Na) move in different directions