lesson 2 cell membrane and transport
TRANSCRIPT
Cell membraneTRANSPORT
Membrane Structure
Passive Transport
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.
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)
Order the following cups of water from the most
concentrated to the most diluted
a b c
Practice Activities
Practice Activities
Semipermeable
membrane
Draw the arrows indicating in which direction water will move:
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.
Greater particles
Endocytosis
Exocytosis
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