BIO – week 5 – lecture 2 – 4/4/25 – Cytoskeleton
Water potential:
Water flows from high. -> low ground
Water flows from high water potential to low water potential
When solutes are added to water
decreases water potential making it
more negative water potential
Osmotic potential is always negative and pressure potential is always positive.
When the flask is lowered into the beaker -> water rises from the beaker into the flask.
Water potential inside flask is negative (contains dissolved solutes which reduce ater
potential) -> water goes into flask.
Why does water stop flowing into flask? -> water rises up flask -> negative osmotic pressure
in flask -> weight of flask pushing down on beaker water and out of flask. (when water
potential at bottom of flask and water potential in beaker are equal water will stop flowing)
Answer from powerpoint:
, One cell in large bathing solution -> wont affect bathing solution -> bathing solution will
always be 1 mM glucose. -> once equilibrium reached glucose concentration in cell will be 1
mM.
(glucose uncharged so not influenced by electrical gradient of -60 mV)
Conc gradient -> bicarbonate wants to go into cell -> bicarbonate is negatively charged but
negative charge of cell pushes bicarbonate out of cell (negative push out negative) -> less
than 1 mM
Water potential:
Water flows from high. -> low ground
Water flows from high water potential to low water potential
When solutes are added to water
decreases water potential making it
more negative water potential
Osmotic potential is always negative and pressure potential is always positive.
When the flask is lowered into the beaker -> water rises from the beaker into the flask.
Water potential inside flask is negative (contains dissolved solutes which reduce ater
potential) -> water goes into flask.
Why does water stop flowing into flask? -> water rises up flask -> negative osmotic pressure
in flask -> weight of flask pushing down on beaker water and out of flask. (when water
potential at bottom of flask and water potential in beaker are equal water will stop flowing)
Answer from powerpoint:
, One cell in large bathing solution -> wont affect bathing solution -> bathing solution will
always be 1 mM glucose. -> once equilibrium reached glucose concentration in cell will be 1
mM.
(glucose uncharged so not influenced by electrical gradient of -60 mV)
Conc gradient -> bicarbonate wants to go into cell -> bicarbonate is negatively charged but
negative charge of cell pushes bicarbonate out of cell (negative push out negative) -> less
than 1 mM
