Cell transport Flashcards
Definition of diffusion
Net movement of particles from an area of high concentration to low concentration
Definition of osmosis
Net movement of water particles from an area of high concentration to low concentration across a partially permeable membrane
Definition of active transport
Movement of particles from an area of low concentration to high concentration using energy from respiration
Is energy required for active transport
Yes
Examples of diffusion in humans
Nutrients in small intestine diffuse into capillaries through villi
Gas exchange in alveoli
Urea diffuses from cells to blood for excretion in kidney
What factors can affect rate of diffusion
Difference in concentration
Temperature
SA of membrane
How does a higher temp affect rate of diffusion
Faster rate due to quicker movement of particles
How does a steeper concentration gradient affect rate of diffusion
Faster rate
How does a larger SA affect rate of diffusion
Faster rate
Example of osmosis in plant
Water moving from soil into root hair cell
Active transport example in humans
Sugar is absorbed from small intestine into the blood where there is a higher concentration
Example of active transport in plants
Absorbing mineral ions into root hair cells from the soil where there is a lower concentration
What is the function of the villi in small intestine
Absorbing nutrients
Adaptations of villi in small intestine
Network of capillaries
Large SA
One cell thick
Good blood supply
Function of fish gills
Gas exchange
