transport mechanisms

Question 1

the intracellular fluid is composed mostly of which types of ions

Answer 1

potassium, slightly more Mg+, phosphates and proteins

Question 2

the extracellular fluid is composed of mostly which type of ions?

Answer 2

sodium and chloride

Question 3

factors that affect the rate of diffusion

Answer 3

-number of protein channels
-lipid solubility
-temperature
-molecular weight of substances diffusing
-thickness of membrane
-concentration differences
-charge gradient

Question 4

how does active transport work?

Answer 4

moves molecules against concentration gradient (uphill)
- uses a carrier protein
-requires ATP (energy)

Question 5

how does diffusion work

Answer 5

moves substances from an area of high concentration to low concentration
-passive transport
-random movement

Question 6

the Na+/K+ pump is an example of which type of transport

Answer 6

active

Question 7

what does the Na+/K+ pump do?

Answer 7

maintains Na+ and K+ difference across cell membrane
-controls cell volume

Question 8

is the electrical potential across a cell membrane positive or negative?

Answer 8

negative d/t Na+/K+ pump

Question 9

for every __ Na+ out of cell, __ K+ is transported into the cell

Answer 9

3 Na+ out of cell, 2 K+ into cell

Question 10

is Ca + pumped into or out of cell membrane

Answer 10

out