B1 : Diffusion Flashcards
What is diffusion
Diffusion is the movement of particles from an area of high concentration to an area of low concentration, it is passive and does not require energy
What conditions speed the rate of diffusion
Is the concentration gradient is larger
If the temperature is higher, the rate of diffusion increases because the kinetic energy store of the particles increases and the particles move faster
A larger surface area also increases the rate of diffusion
How do you improve diffusion
Increase surface area
What substances commonly enter cells
Oxygen, Glucose, minerals
What substances are commonly removed by cells?
Urea, carbon dioxide and water.
Define diffusion
Diffusion is the movement of particles from an area of high concentration to an area of low concentration. This goes down the concentration gradient and is a passive process that requires no energy.
What is the function of the cell membrane?
To control what moves into and out of the cell.
State two factors that can affect diffusion
Temperature and concentration.
Why does increased temperature increase diffusion?
Increasing temperature increases diffusion because the particles gain more kinetic energy which causes them to move more. The increased movement means that they travel around the area more quickly filling the gaps.
What diffuses from your lungs into red blood cells?
Oxygen
What diffuses from your red blood cells to your muscle cells?
Oxygen
Explain why so many cells have folded membranes along at least one surface.
Many cells have folded membranes to increase their surface area to volume ratio increasing the rate of diffusion.
