Diffusion

Question 1

What is Diffusion?

Answer 1

It is the spreading out of gas particles when a substance goes from a high concentration to a low concentration of particles.

Question 2

Diffusion has a ___ movement:

Answer 2

Net movement

Question 3

Diffusion has a ______ movement of particles

Answer 3

The random movement of particles

Question 4

What is the concentration gradient?

Answer 4

The difference between two areas of concentration

Question 5

Give an example of what occurs down a concentration gradient

Answer 5

Temperature

Question 6

The bigger the difference in concentration gradient then the steeper the…

Answer 6

Concentration gradient and increase the rate of diffusion.

Question 7

Give an example of diffusion

Answer 7

When perfume is sprayed

Question 8

If there is a big difference between the two areas the will diffusion happen quickly?

Answer 8

Yes because the concentration gradient is high.

Question 9

If there is a small difference between the two areas the will diffusion happen quickly?

Answer 9

No because there is a small concentration gradient.

Question 10

What is the formulae for Net movement?

Answer 10

particles moving in-particles moving out.

Question 11

What are the factors which affect the rate of diffusion?

Answer 11

Concentration, Temperature and surface area.

Question 12

Why is diffusion special in living organisms?

Answer 12

So substances can move in and out of the cell through the membrane.

Question 13

What substances are diffused in and out the cell?

Answer 13

In=simple sugers ,gases, oxygen, C02 out =urea.

Question 14

How does the Urea pass out?

Answer 14

Passes out through the liver cells then into the blood plasma then excreted by the kidneys.

Question 15

How does the Oxygen get absorbed into the body and describe it:

Answer 15

Moves from diffusion from air then goes to the lungs then to the red blood cells then to the cell membranes.

Question 16

How does the C02 pass out?

Answer 16

The C02 escapes from the cell through the cell membrane, in the red blood cells in the lungs and out into the air.

Question 17

How are cells adapted to diffusion?

Answer 17

The most common is the increased surface area to volume ratio.

Question 18

What has a bigger surface area to volume ratio an elephant or mouse?

Answer 18

A mouse

Question 19

How do you work out the Surface area to volume ratio?

Answer 19

Work out area then surface area then compare.

Question 20

How can you prove that a mouse has a bigger surface area to volume ratio?

Answer 20

Through working out the surface area to volume ratio of both animals and then comparing the ratios

Question 21

Step by step how is air reached to the alveoli?

Answer 21

Through the trachrea-> bronchi ->bronchioles->alveoli

Question 22

How is air sent into the capillaries from the alveoli?

Answer 22

The oxygen from the lungs is diffused into the capillary into the red blood cells through a 2 cell thick wall. Through a high concentration gradient.

Question 23

How does CO2 diffuse Into the lungs?

Answer 23

The C02 is diffused through the 2 cell thick wall against the high concentration gradient of oxygen and C02.

Question 24

How is the steep concentration gradient kept when diffusing air in the lungs?

Answer 24

Ventilation and Circulation.

Question 25

How do fish breathe?

Answer 25

Through their gills, with the oxygen dissolved in water.

Question 26

How are the gills adapted for breathing underwater with diffusion?

Answer 26

Having a steep concentration gradient, a short diffusion distance, and large surface area.