Moving Cellular Materials Cell Membrane: boundaries between cells and their organelles Controls the movement of substances into and out of cells Semipermeable lets only certain substances in or out depends on the physical & chemical properties of the substance passing through Cell needs food, oxygen & minerals Cell needs to release waste

passive transport is WITHOUT energy active transport is WITH energy The movement of substances through the cell membrane can 
happen through passive and active transport passive transport is WITHOUT energy active transport is WITH energy Passive Transport Active carbon dioxide

Cell transport animation Passive_Transport Passive Transport movement of substances 
through a cell membrane 
without using the cell's energy depends on the amount of 
substance on each side of the 
membrane Cell transport animation

Goes from HIGH to LOW Diffusion BP diffusion until equilibrium occurs Substances always move from HIGH 
concentration to LOW concentration.

DIFFUSION & OSMOSIS Diffusion is the movement of molecules from areas of high concentration 

to areas of low concentration. Osmosis is the diffusion of water molecules through the cell membrane.

Osmosis http://mw2.concord.org/public/part1/dan/DandOpage1.cml

Use an arrow to show the direction the particles will move. Move circle and triangles to show equilibrium Use an arrow to show the direction the 

particles will move.

Use an arrow to show the direction the water particles will move. Diffusion and Osmosis Use an arrow to show the direction the water particles will move. Egg Lab water corn syrup

Facilitated Diffusion 3rd type of passive transport (no energy used) Transport protein glucose molecules When molecule pass through a cell membrane using special proteins 
because they are tool large or chemically unable

Two types of transport proteins: Channel proteins: form pores through the membrane atomic particles like sodium ions & potassium ions Carrier proteins: carry large molecules like sugar

Facilitated Diffusion (glucose) (minerals) (Oxygen & Carbon Dioxide) Osmosis (water) Facilitated Diffusion (glucose) (minerals) BP Active Transport Transport protein carbon dioxide oxygen Glucose Water

Active Transport the movement of substances through a cell membrane only 
using the cell's energy substances move from low concentrations to areas of 
higher concentration get nutrients from environment through carrier proteins and 
remove waste materials Passive Transport high low no energy Active Transport low high uses energy

Endocytosis is the process during which a cell takes in a large substance by surrounding it with the cell membrane, forming a vesicle inside the cell Substance 
too large to 
come in During the process of Exocytosis, a cell's vesicles release their contents 
outside the cell by joining with the the cell membrane Substances 
too large to 
go out