Dissolved substances Flashcards
How do dissolved substances move?
Diffusion and active transport
What is osmosis?
- Movement of water
- Across a partially permeable membrane
- From an area of high water concentration to an area of low water concentration
What do sports drink contain?
- Sugar to replace the sugar used in energy released during exercise
- They also contain water and ions to replace those lost from sweating
What happens if the water and ions are not replaced?
The body will be out of balance and the cells will not work efficiently
Where does the energy come from for active transport?
Respiration
What does active transport allow cells to do?
Absorb substances from very dilute solutions
How are organ systems specialized for exchanging materials?
- Large surface area
- Being thin for a more direct diffusion route
How are animals adapted for exchanging materials?
- Having an efficient blood supply
- Being ventilated for efficient gaseous exchange
How is the surface area increased in the lungs?
Alveoli
How is the surface area increased in the small intestine?
Villi
What do the capillaries do in the villi?
They absorb the products of digestion by diffusion and active transport
