Active Transport

Question 1

What is active transport

Answer 1

Dissolved molecules move across a cell membrane from a lower to as higher concentration. Particles move against the concentration gradient

Question 2

What are the 3 steps in co transport

Answer 2

-facilitated diffusion of glucose in the cell
-sp pump created concentration gradient for na+ in the cell
-sodium ions diffuse down the concentration gradient taking in glucose molecules with it

Question 3

What are the 4 methods of membrane transport and where are they used

Answer 3

Co-transport (active) for glucose, amino acids
Facilitated diffusion for monosaccharides
Osmosis for water
Simple diffusion for triglycerides

Question 4

What 5 factors influence movement of materials

Answer 4

-concentration gradient
-temperature
-distance
-metabolic rate
-surface area and thickness of membrane

Question 5

How does concentration gradient influence movement of materials

Answer 5

The greater the difference in concentration, the more rapid the diffusion. The closer the distribution of the material gets to equilibrium the slower the rate of diffusion becomes which is why cotransport is needed for glucose absorption

Question 6

How does temperature influence movement of materials

Answer 6

Higher temp increases kinetic energy and therefore thee movement of molecules, increasing the rate of diffusion. Lower temperatures decrease the energy of molecules, thus decreasing the rate of diffusion

Question 7

How does metabolic rate influence movement of materials

Answer 7

During high energy expenditure the metabolic rate will increase and lessen when we are inactive

Question 8

How does distance to travel influence movement of materials

Answer 8

The greater the distance that a substance must travel the slower the rate of diffusion

Question 9

How does surface area and thickness of plasma membrane influence movement of materials

Answer 9

Increases surface area increases the rate of diffusion, where as a thicker membrane reduces it.