Bell Ringer

Bell RingerChallenge: See if you can draw and

label the cell membrane with no notes!

Lesson Overview:Observe the incredible eggsBrief PowerPoint on transportGummy Bear Osmosis LabMembrane videoMurky and Main Points

Membrane Transport

Incredible Eggs

DiffusionIs a type passive transport

Is the movement of substances from an area of high concentration to low concentration

no energy required

LE 7-11a

Molecules Membrane (cross section)

WATER

Net diffusion Net diffusion Equilibrium

Diffusion of one solute

Solute - a substance dissolved in another substance. Ex: dye molecules in water.

LE 7-11b

Net diffusion Net diffusion Equilibrium

Diffusion of two solutes

Net diffusion Net diffusion Equilibrium

Real life connection: Sickle Cell AnemiaOxygen diffuses in and out of normal blood

cells. Can’t in abnormal shaped cells.

• Estimated 100,000 Americans have sickle cell disease.

• 1 in 12 African Americans have sickle cell trait. • Means that they can

pass the trait to children

OsmosisIs diffusion of water across a membrane

Moves from an area of its high concentration to an area of its low conc.

Is energy required?

OsmosisExample

www.fmhs.uaeu.ac.ae

Water Water & Salt

Water Moves

Water Moves until there is the same

# of water molecules on each

side

Osmosis TermsHypertonic

solution with high concentration of soluteSolute – a substance dissolved in water. Ex:

salt

Hypotonicsolution with low concentration of solute

Isotonicsolutions with the same solute

concentration

Osmosis Effects on Cells

When a cell is placed in a Hypotonic solution:

Cell gains water through osmosis

When a cell is placed a Hypertonic solution:

Cell loses water through osmosis

Effects of Osmosis on Cells

Video http://youtu.be/2UPqLm-uDnI

Murky and Main PointsWrite 3 main points from today’s lesson.

Must be content-based. Ex: The plasma membrane is selectively

permeable to control what is allowed in and out of the cell.

Write 1 or more murky points from today’s lesson. This is material that is unclear to you.

Write 1 favorite point from today’s lesson. What did you enjoy about class today?