Dissolved Substances Flashcards
Dissolved substances move by what two methods
Diffusion
Active transport
How does water move across boundaries
Explain this method
Osmosis is the diffusion of water from a low to high concentration through partially permeable membranes
What can a difference in concentration do both inside and outside a cell
Water to move in or out of a cell through osmosis
What do most soft drinks contain
3 things
Water
Sugar
Ions
What happens if water and ions are not replaced in a body
Ion/water balance is disturbed and the cells do not work as efficiently
What is the process at which substances move against a concentration gradient
Active transport which requires energy from respiration
Enables cells to absorb ions from dilute areas
How is gas exchange increased in humans
SA increased by alveoli
SA of small intestines increased by villi
What is the function of villi in the small intestines
Large surface area as folded membrane
Has an extensive network of capillaries to a sieve the products of digestion
What two gas exchange processes does the villi do
Diffusion
Active transport
