1.6 Diffusion

Question 1

What is diffusion

Answer 1

-is the net movement of particles from an area of high conecntration to an area of low concentration.
-when many paryicles are close together they collide sith each ither more often resulting in the moving arohnd and becoming mixed with other particles in area.

Question 2

Examples where diffusion takes place

Answer 2

-oxygen moves through alveloi into the red blood cells, and is carried to cells across the body for repsiration. Carb on dioxide is waste product moves from red blood cell into lungs to be exhaled. Movement of gases is called gas exchange
-urea moves from li er cells into the blood plasma to be rransported to kidney for excretion

Question 3

Factors that affect rate of diffusion

Answer 3

Conecntration gradient-greater the difference in concentration, the faster the rate of diffusion. This is because more particles are randomly moving diwn the gradient than are moving against it

Temperature-the greater the temperature, the greater movement of particles, resulting in more collisions and therefore fatser rate of diffusion

surface area of the membrane- greater the surface area, the more soace for partickes to moev through resulting in faster rate of diffusion