Membrane Transport

Question 1

Define iso-osmolar

Answer 1

A solution having the same osmolarity as another solution

Question 2

Define hypo-osmolar

Answer 2

A solution with lower osmolarity compared to another solution

Question 3

Define hyper-osmolar

Answer 3

A solution with higher osmolarity

Question 4

Isotonic

Answer 4

A solution that does not cause cells to shrink or swell

Question 5

What is a hypotonic solution?

Answer 5

A solution that causes cells to swell due to water moving in.

Question 6

What is a hypertonic solution?

Answer 6

A solution that causes cells to shrink due to water moving out

Question 7

What are the main ions in extracellular fluid?

Answer 7

Na+
Cl-
HCO3-

Question 8

What are the main ions in intracellular fluid?

Answer 8

K+
Mg2+

Question 9

Function of channels

Answer 9

Allow passive movement of ions or water

Question 10

Function of channels

Answer 10

Allow passive movement of ions or water

Question 11

Function of channels

Answer 11

Allow passive movement of molecules (ions or water)

Question 12

What are antiporters?

Answer 12

Membrane proteins that facilitate transport of 2 or more molecules across a membrane, but in opposite directions

Question 13

Function of symporters

Answer 13

Move molecules in the same direction across a membrane

Question 14

Facilitative vs Active transporters

Answer 14

Facilitative: without using energy

Active: against concentration gradient using energy (ATP)