Transport in Cells

Question 1

Diffusion

Answer 1

The spreading out of the particles of any substance in a solution, resulting in a movement from an area of higher to lower concentration

Question 2

How may substances move in and out of cells?

Answer 2

Across the cell membrane via diffusion

Question 3

3 Factors affecting rate of diffusion

Answer 3

Difference in concentrations, temperature, SA of membrane

Question 4

Exchange Surfaces

Answer 4

Specialized structures in the body that allow for the exchange of materials between the body and the environment.

Question 5

In multicellular organisms, surfaces and organ systems are adpted for…

Answer 5

Exchanging materials

Question 6

4 Factors increasing the effectiveness of an exchange surface

Answer 6

Large SA, Being thin to provide a short diffusion path, Having an efficint blood supply, Being ventilated

Question 7

Osmosis

Answer 7

Diffusion of water from a more dilute to more concentrated solution through a partially permeable membrane that allows the passage of water molecules

Question 8

What does active transport do?

Answer 8

Moves substances from a more dilute to a more concentrated solution

Question 9

Give an example of active transport

Answer 9

Allows mineral ions to be absorbed into plant root hairs from very dilute solutions in the soil

Question 10

Exchange surfaces have..

Answer 10

large SA to volume ratio