Lesson 2 cell membrane and transport
Transcript of Lesson 2 cell membrane and transport
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Cell membraneTRANSPORT
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Membrane Structure
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Passive Transport
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Difusion
O Small molecules like
oxygen or carbon
dioxide cross the cell
membrane. They
move towards the
side with less
concentration in
order to equal
concentrations.
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OsmosisO It is the movement of water across a partially
permeable membrane from an area of high water
concentration (i.e. dilute solution) to an area of low
water concentration (i.e. a concentrated solution)
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Order the following cups of water from the most
concentrated to the most diluted
a b c
Practice Activities
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Practice Activities
Semipermeable
membrane
Draw the arrows indicating in which direction water will move:
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Active Transport
O Sometimes the cellneeds to take in molecules that are in a smallerconcentration in theexterior. Therefore, in order to introduce them into the cell, the cell needs to use energy.
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Greater particles
Endocytosis
Exocytosis
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LAB ACTIVITY
O Objective: to observe that osmosis takes
place across the cell wall and membrane of
plant cells.
O Hypothesis
O Context
O Materials
O Procedure