Topic 2: Cell Physiology 1 - Membrane Transport (Passive)

Question 1

What is membrane transport?

Answer 1

• movement of material between the intra and extracellular fluids

Question 2

What is a solute?

Answer 2

• substance dissolved in a solution

Question 3

What is a solvent?

Answer 3

• Substance the solute is dissolved in
  ex. water

Question 4

What is passive transport? (3)

Answer 4

• no energy required (no ATP)
• movement from a high to low CG (down CG)
• the greater the difference in concentration the more molecules want to move

Question 5

What are 5 types of passive transport?

Answer 5

1. Simple diffusion
2. Facilitated diffusion
3. Facilitated transport
4. Osmosis
5. Bulk Flow

Question 6

What is simple diffusion? (2)

Answer 6

• solute movement
• solute diffuses directly through cell membrane bilayer

Question 7

Which molecules use simple diffusion?

Answer 7

• small and lipid soluble molecules (O2, CO2, etc.)

Question 8

What is facilitated diffusion? (2)

Answer 8

• solute movement
• ions diffuse through membrane via protein channels

Question 9

What is facilitated transport? (3)

Answer 9

• solute movement
• diffuse across membrane using a specific carrier protein
• must bind to protein to be transported

Question 10

Which solutes use facilitated transport? (3)

Answer 10

• large
• charged
• water soluble molecules

Question 11

What is an example of facilitated transport?

Answer 11

• glucose into liver or skeletal muscle

Question 12

What is osmosis? (2)

Answer 12

• solvent movement
• movement of water across a semipermeable membrane (permeable to H2O) due to water concentration difference

Question 13

What occurs in osmosis?

Answer 13

water moves down its concentration gradient via pores (channels) or across membrane layer

Question 14

In osmosis, what is a dilute solution?

Answer 14

high water concentration and low [solute]

Question 15

In osmosis, what is a concentrated solution?

Answer 15

• low [H2O] and high [solute]

Question 16

What does solute concentration depend on?

Answer 16

number of ions or molecules, not the type