B2.1 Supplying The Cell Flashcards
What is diffusion?
Net movement of particles from a high concentration to a low concentration.
How do particles move in a concentration gradient?
They move down the concentration gradient
Diffusion continues until…
The concentration of articles are equal everywhere. This means the concentration gradient is zero
Diffusion passes through…
The cell membrane
Factors that affect diffusion are..
Distance
Concentration gradient
Surface area
What is osmosis?
It is a diffusion of water molecules through a selectively permeable membrane
Dilute solutions have..
High concentration of water
Concentrated solutions have…
Low concentration of water
What will happen when you put animal cell into a low concentration of water?
It will expand and burst
What would happen if you put the animal cell in a concentrated solution?
The water will move out and the cell will shrink
What will happen when water goes into a plant cell?
It will expand but not burst because of the cell wall. It will go turgid
What will happen when plant cell is put into a concentrated solution
Cell shrinks and becomes flaccid
What is active transport ?
Active transport moves substances from a more dilute solution to a more concentrated solution
Difference between diffusion and active transport?
Diffusion moves down concentration gradient and do not need energy,
Active transport particles move against the concentration gradient and needs energy
What is mitosis?
Body cells divide to replace worn out cells, to repair damage tissue, and to enable the organism to increase in size.
