Diffusion Flashcards
What is Diffusion?
It is the spreading out of gas particles when a substance goes from a high concentration to a low concentration of particles.
Diffusion has a ___ movement:
Net movement
Diffusion has a ______ movement of particles
The random movement of particles
What is the concentration gradient?
The difference between two areas of concentration
Give an example of what occurs down a concentration gradient
Temperature
The bigger the difference in concentration gradient then the steeper the…
Concentration gradient and increase the rate of diffusion.
Give an example of diffusion
When perfume is sprayed
If there is a big difference between the two areas the will diffusion happen quickly?
Yes because the concentration gradient is high.
If there is a small difference between the two areas the will diffusion happen quickly?
No because there is a small concentration gradient.
What is the formulae for Net movement?
particles moving in-particles moving out.
What are the factors which affect the rate of diffusion?
Concentration, Temperature and surface area.
Why is diffusion special in living organisms?
So substances can move in and out of the cell through the membrane.
What substances are diffused in and out the cell?
In=simple sugers ,gases, oxygen, C02 out =urea.
How does the Urea pass out?
Passes out through the liver cells then into the blood plasma then excreted by the kidneys.
How does the Oxygen get absorbed into the body and describe it:
Moves from diffusion from air then goes to the lungs then to the red blood cells then to the cell membranes.
How does the C02 pass out?
The C02 escapes from the cell through the cell membrane, in the red blood cells in the lungs and out into the air.
How are cells adapted to diffusion?
The most common is the increased surface area to volume ratio.
What has a bigger surface area to volume ratio an elephant or mouse?
A mouse
How do you work out the Surface area to volume ratio?
Work out area then surface area then compare.
How can you prove that a mouse has a bigger surface area to volume ratio?
Through working out the surface area to volume ratio of both animals and then comparing the ratios
Step by step how is air reached to the alveoli?
Through the trachrea-> bronchi ->bronchioles->alveoli
How is air sent into the capillaries from the alveoli?
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.
How does CO2 diffuse Into the lungs?
The C02 is diffused through the 2 cell thick wall against the high concentration gradient of oxygen and C02.
How is the steep concentration gradient kept when diffusing air in the lungs?
Ventilation and Circulation.
How do fish breathe?
Through their gills, with the oxygen dissolved in water.
How are the gills adapted for breathing underwater with diffusion?
Having a steep concentration gradient, a short diffusion distance, and large surface area.
