Membrane Transport

Question 1

What are some examples of passive transport?

Answer 1

Diffusion: passive mixing of substances resulting in transport along a concentration gradient

Question 2

What is osmosis?

Answer 2

• the diffusion of water across a selectively permeable membrane
• water moves from a low solute concentration to a high solute concentration

Question 3

What is a hypertonic solution?

Answer 3

• when there is a higher solute concentration outside the membrane
• net flow of water OUT

Question 4

What is a hypotonic solution?

Answer 4

• higher solute concentration inside the membrane

- net flow of water IN

Question 5

What is active transport?

Answer 5

• substances are moved across the membrane against the concentration gradient
• requires the expenditure of energy (directly or indirectly)