lesson 2 cell membrane and transport

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