Diffusion

Question 1

Why is diffusion passive?

Answer 1

• all particles constantly in motion due to KE they possess
• motion is random & constantly bouncing off each other
• energy is natural rather than ATP

Question 2

Def of diffusion

Answer 2

The net movement of molecules or ions from a highly concentrated region to a lower conc region until evenly distributed

Question 3

What is facilitated diffusion?

Answer 3

• a passive process that relies on the inbuilt KE of the diffusing molecules
• involves protein channels & carrier proteins

Question 4

Protein channels

Answer 4

• form water-filled hydrophillic channels
• selective& open specifically so has control
• ions bind with protein so it changes shape in a way that closes it to one aide if mem and opens it to the other side

Question 5

Carrier proteins

Answer 5

• they span the plasma membrane
• when a molecule is specific to protein that is present, it binds to protein
• causes it to change shape in a way that the molecule is released inside of men