Lab 4 Diffusion and Osmosis
q q q q BIO201L
(LAB 4) Straighter line anatomy and physiology 1
lab BIO201L diffusion and osmosis worksheet
2025 Already Tested
StudentqName:qClickqhereqtoqenterqtext.
AccessqCodeq(locatedqonqtheqlidqofqyourqlabqkit):qClickqhereqtoqenterqtext.
Pre-LabqQuestions:
1. Compareqandqcontrastqdiffusionqandqosmosis.
Diffusionqandqosmosisqareqtwoqprocessesqinvolvedqinqtheqmovementqofqsubstancesqacrossqcellq
membranes.qDiffusionqisqtheqpassiveqmovementqofqmoleculesqorqionsqfromqanqareaqofqhigherqcon
centrationqtoqanqareaqofqlowerqconcentration,qwhileqosmosisqspecificallyqrefersqtoqtheqmovement
qofqwaterqmoleculesqacrossqaqselectivelyqpermeableqmembrane.qDiffusionqcanqoccurqforqvariousq
typesqofqparticles,qwhileqosmosisqisqexclusivelyqrelatedqtoqtheqmovementqofqwater.qBothqprocess
esqrelyqonqconcentrationqgradients,qbutqosmosisqisqspecificallyqinfluencedqbyqsoluteqconcentratio
nqgradients.
2. Whatqisqtheqwaterqpotentialqofqanqopenqbeakerqcontainingqpureqwater?qz
ero
3. Whyqdon’tqredqbloodqcellsqswellqorqshrinkqinqblood?
Redqbloodqcellsqdoqnotqswellqorqshrinkqinqbloodqdueqtoqtheirquniqueqstructureqandqtheqosmoticqpr
opertiesqofqtheqbloodqplasma.qRedqbloodqcellsqcontainqaqsemipermeableqmembraneqthatqallowsq
waterqmoleculesqtoqfreelyqpassqthrough,qbutqrestrictsqtheqmovementqofqsolutes.qTheqbloodqplasm
a,qwhichqsurroundsqtheqredqbloodqcells,qmaintainsqanqisotonicqenvironment,qmeaningqitqhasqtheqs
ameqsoluteqconcentrationqasqtheqinteriorqofqtheqredqbloodqcells.qThisqbalancedqosmoticqenvironm
entqpreventsqwaterqfromqenteringqorqleavingqtheqredqbloodqcellsqinqsignificantqamounts.qAsqaqresul
t,qtheqredqbloodqcellsqmaintainqtheirqshapeqandqsizeqwithoutqswellingqorqshrinking.
Experimentq1:qDiffusionqthroughqaqLiquid
Tableq1:qRateqofqDiffusionqinqCornqSyrup
, Lab 4 Diffusion and Osmosis
q q q q BIO201L
Timeq(sec) BlueqDye RedqDye
10 1.5 1.9
20 1.8 2.0
30 2.0 2.2
40 2.1 2.3
50 2.2 2.4
q q q q BIO201L
(LAB 4) Straighter line anatomy and physiology 1
lab BIO201L diffusion and osmosis worksheet
2025 Already Tested
StudentqName:qClickqhereqtoqenterqtext.
AccessqCodeq(locatedqonqtheqlidqofqyourqlabqkit):qClickqhereqtoqenterqtext.
Pre-LabqQuestions:
1. Compareqandqcontrastqdiffusionqandqosmosis.
Diffusionqandqosmosisqareqtwoqprocessesqinvolvedqinqtheqmovementqofqsubstancesqacrossqcellq
membranes.qDiffusionqisqtheqpassiveqmovementqofqmoleculesqorqionsqfromqanqareaqofqhigherqcon
centrationqtoqanqareaqofqlowerqconcentration,qwhileqosmosisqspecificallyqrefersqtoqtheqmovement
qofqwaterqmoleculesqacrossqaqselectivelyqpermeableqmembrane.qDiffusionqcanqoccurqforqvariousq
typesqofqparticles,qwhileqosmosisqisqexclusivelyqrelatedqtoqtheqmovementqofqwater.qBothqprocess
esqrelyqonqconcentrationqgradients,qbutqosmosisqisqspecificallyqinfluencedqbyqsoluteqconcentratio
nqgradients.
2. Whatqisqtheqwaterqpotentialqofqanqopenqbeakerqcontainingqpureqwater?qz
ero
3. Whyqdon’tqredqbloodqcellsqswellqorqshrinkqinqblood?
Redqbloodqcellsqdoqnotqswellqorqshrinkqinqbloodqdueqtoqtheirquniqueqstructureqandqtheqosmoticqpr
opertiesqofqtheqbloodqplasma.qRedqbloodqcellsqcontainqaqsemipermeableqmembraneqthatqallowsq
waterqmoleculesqtoqfreelyqpassqthrough,qbutqrestrictsqtheqmovementqofqsolutes.qTheqbloodqplasm
a,qwhichqsurroundsqtheqredqbloodqcells,qmaintainsqanqisotonicqenvironment,qmeaningqitqhasqtheqs
ameqsoluteqconcentrationqasqtheqinteriorqofqtheqredqbloodqcells.qThisqbalancedqosmoticqenvironm
entqpreventsqwaterqfromqenteringqorqleavingqtheqredqbloodqcellsqinqsignificantqamounts.qAsqaqresul
t,qtheqredqbloodqcellsqmaintainqtheirqshapeqandqsizeqwithoutqswellingqorqshrinking.
Experimentq1:qDiffusionqthroughqaqLiquid
Tableq1:qRateqofqDiffusionqinqCornqSyrup
, Lab 4 Diffusion and Osmosis
q q q q BIO201L
Timeq(sec) BlueqDye RedqDye
10 1.5 1.9
20 1.8 2.0
30 2.0 2.2
40 2.1 2.3
50 2.2 2.4
