Exchanging materials Flashcards
where is oxygen exchanged and for what purpose
in the alveoli, for respiration
where is carbon dioxide exchanged and for what purpose
alveoli waste product from metabolism
where is water exchanged and for what purpose
in the kidney nephrons, needed for cells to function
where are dissolved food molecules exchanged and for what purpose
the small intestine, respiration
where are mineral ions exchanged and for what purpose
small intestines, needed for cells to function
where are the alveoli found
in the lungs
where is urea exchanged and for what purpose
nephrons in the urea, the waste product of metabolism
what are 3 adaptations that the lungs have to increase gas exchange
- millions of alveoli to create a large surface area
- each alveol is closely associated with capillaries that have small cell walls to minimise diffusion distance
- breathing keeps a high concentration gradient
what 3 factors affect the rate of diffusion
surface area
distance of discussion
concentration gradient
what is the formula for the rate of diffusion
rate of diffusion = (SA * conc diff) / membrane thickness
