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7/31/2019 Ex 4 A&D PPT
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PASSIVe
TRANSPORt
Diffusion
andOsmosis
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Introduction
Cell membranev helps maintain internal balance or
homeostasis through cell transport.
Cell Transport
v movement of substances in andout of a cell
types: a) Active and b) Passive
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Passive Transport
movement of substances across acell membrane with no energyneeded
Types of Passive Transport:
a) Diffusion
b) Osmosis
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Diffusion
movement of molecules from aregion of greater concentration to aless concentrated one until
equilibrium
Osmosis
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Osmosis
special type of diffusion
mainly concerned with themovement ofwaterin living systems
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Osmosis
movement of water molecules acrossa semi-permeable membrane froman area of high water concentration
(low solute concentration) to an areaof low water concentration (highsolute concentration).
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Objectives
(a) illustrate the process of diffusion intwo different media,
(b) demonstrate volume change as aconsequence of osmosis, and
(c) give the students the ability topredict the direction of diffusion and
osmosis across membranes given theconcentrations.
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MethodologyA. Diffusion in Water
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B). Osmosis
longganisa skin
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esu s an
DiscussionMedium Time of Diffusion
(min)
Distilled Water 1:18.5
Tap Water 1:28.5
Table 1. Rate of Diffusion of KMnO4 Crystals
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Osmosis
Before After
Volume of solution inside
the longganisa skin (mL) 30 mL 37.5 mL
Table 2.Volume of Solution inside the Longganisa Skin
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Conclusion Components of the medium affect
the rate of diffusion. Water moves from a region of low
solute concentration to a region ofhigh solute concentration.
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ecommen a o
n Osmosis: longer time to submergethe setup to ensure a significantchange in volume, in the right
manner.
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ReferencesAgapito, J.D. et al. Laboratory manual in biology 22: Generalzoology3rd Ed. (Dept. of Biology, CAS, U.P. Manila)
Hallare, A.V. Student handbook in general zoologyPart I(Dept.
of Biology, CAS, U.P. Manila)
Jacobs, C. Diffusion and Osmosis. 1998. Henry FordCommunity College. 07 July 2012
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THANK YOU FOR
LISTENING!-BLACK SCHWANN-
*BAUTISTA-BIGAY-DE LEON-FUENTES-LOZANO*