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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*