Revision notes Flashcards
Diffusion
Goes from a high concentration to a low concentration until equilibrium
Active transport
From low concentration to high concentration. It requires carrier proteins
Where does active transport get its energy from?
Mitochondria
What do diffusion and active transport have in common?
Their movement of particles as they go in and out of cells
Examples of active transport
Move the glucose from your gut into your blood against the concentration gradient
Example of active transport
Plants use it to move mineral ions from the soil into the roots against the concentration gradient
Example of active transport
Used to remove excess salt of the body
Exchange
Every organism, whatever its size, needs to exchange minerals with the environment
Exchange
How easy the exchange of substances is depends on the organisms surface area to volume ratio
Volume ratio of exchange
SA (surface area) : V (volume)
Exchange
The smaller the organism, the larger the surface area
What subtances do animals need to take in from the environment
Oxygen and glucose
Substances animals need to release into the environment
Carbon dioxide and waste products
What do volume and surface area have in common
The smaller the volume, the bigger the surface area
Crenation
Animal cells places in a concentrated solution will lose water and therefore shrivel .
