Osmosis,Active Transport and diffusion Flashcards
What is diffusion
Diffusion is the movement of particles from an area of high concentration to an area of low concentration
Name two factors that effect diffusion
Temperature and concentration
Why doe’s temperature effect diffusion
Because an increase in temperature increases the rate of diffusion and this is because particles gain more kinetic energy and move faster
How does the concentration gradient effect diffusion
Because as the concentration gradient increases the rate of diffusion increases and creates a steeper concentration gradient
What is a concentration gradient
It moves from low to high
What is active transport
The movement of particles against the concentration gradient using energy.The molecules are too big to fit in the cell membrane so are carried by proteins to the cell membrane
Where does diffusion take place in animals
In the alveoli and small intestine
Explain how diffusion takes place in the alveoli(lungs)
Oxygen diffuses from the alveoli (where there is a high concentration of oxygen) into the blood ( where there is low concentration of oxygen).Carbon dioxide on the other hand diffuses from the blood into the alveoli
explain How does diffusion takes place in the small intestine
The soluble food diffuses from the small intestine and goes into the blood
explain In plants where and how diffusion takes place
It takes place in the leaves .Carbon dioxide from the atmosphere diffuses through the stomach into the leaves for photosynthesis and oxygen diffuses out the leaves into the atmosphere
What is osmosis
The movement of water from a dilute solution to a concentrated solution through a semi permeable membrane
By what method does water move in and out of cells
Osmosis
What is a dilute solution
It contains more water
What is a concentrated solution
It contains less water
What is a semi permeable membrane
Only allows certain substances to pass through
