Cell Transport Flashcards
Definition Diffusion
The spreading out of the particles of gas of any substance in a solution ( a solute)
Net movement of Diffusion
From high to low concentration, down the concentration gradient
Limiting factors of diffusion
Difference in concentrations, the temperature and the available surface area
How do substances such as urea and glucose and gases such as oxygen and carbon dioxide move out and into cells?
Diffusion
Definition Osmosis
The movement of water to dilute a solution across a partially permeable membrane, Down the concentration gradient
Definition Isotonic
The concentration of the solution is the same inside and outside the cell
Definition Hypertonic
Solution concentration is higher OUTSIDE the cell
Definition Hypotonic
Solution concentration is higher INSIDE the cell
Why is osmosis important in plants?
To maintain turgor ( turgidity )
Definition Active Transport
The movement of substances from a dilute solution to a more concentrated solution against the concentration gradient
Example of Active transport (1animal, 1plant)
Small intestine - uptake of sugar
In the roots - (root hair cells)
When an object increases in mass what happens to SA:V?
Decreases
Why do most exchange surfaces usually have a large SA and thin walls?
To give a short diffusion distance
