Diffusion

Question 1

Why can oxygen and Carbon dioxide diffuse easily through cell membranes?

Answer 1

So small can pass through spaces in phospholipids. Non polar so soluble in lipids

Question 2

What do carrier protiens do?

Answer 2

Move large molecules across membrane
Large molecule attaches to large molecule in membrane
Protien changes shape and releases molecule on other side of membrane

Question 3

What do channel protiens do?

Answer 3

Form pores allow charged particles to diffuse through

Question 4

What does the rate of diffusion depend on in simple diffusion

Answer 4

Concentration gradient
Thickness of exchange surface
Surface srea

Question 5

What does the rate of facilitated diffusion depend on

Answer 5

Concentration gradient

Number of channel or carrier protiens

Question 6

What is diffusion

Answer 6

Net movement of particles from an area of high concentration to an area of low concentration. Diffuse both ways but net movement to lower. Passive process