movement in and out cells Flashcards
define osmosis
Osmosis is the movement of water molecules across a partially permeable membrane from a region of a higher water potential to a region of lower water potential
what is a limitation of the potato experiment
the potato not being fully dried this would increase the mass
what is active transport
when substances are absorbed against the concentration gradient
whats an example of active transport
root hair cells taking up minerals. They use active transport because the concentration of minerals is usually higher in the root hair cells then in the soil around them
where is active transport used in humans
in the gut
why is active transport uses in humans
when there is a lower concentration of nutrients in the gut then there is in the blood this means that the concentration is the wrong way round
how do you work out the area of a surface
length times width
how do you calculate volume
length times width time height
define diffusion
the movement of particles from a region of a higher concentartion to a region of lower concentration.
define diffusion
the movement of particles from a region of a higher concentartion to a region of lower concentration.
what does the cell membrane do
controlls what moves in and out of the cells
when is active transport used
when a subctance needs to be absorbed again st a concentration gradient
how do root hair cells take in minerals
active transport
how do the lungs do gas exchange
they have millions of aveoli
name adaptations that help with diifusion
large surface area,thin wall,good blood supply and moist lining
