Bell ringer: What things do vacuoles store? Between plant cells and animal cells, which one has a smaller vacuoles? Why are chloroplast green? In what part of the cell are ribosomes created? The Golgi apparatus is known as the ups of the cell, one reason is due to the transporting of molecules. Molecules are transported by means of _____________

Bell ringer: Where are Ribosomes created? What filament do both the cytoskeleton and centrioles have in common? Lysosomes contain ____________ enzymes that break down wastes. Cell walls are found in ___________ and ____________ cells

The Cell Membrane; Active & Passive Transport Chapter 7-3 The Cell Membrane; Active & Passive Transport

The Cell Membrane Gatekeeper Semi-permeable Regulates what comes in and out of the cell Main components: proteins and phospholipids

Cell Wall Found only in plant cells and bacteria cells Main function is support

Solutions Mixtures of substances Ex. Salt + water; sugar + water

Diffusion The movement of molecules from an area of high concentration to an area of low concentration Molecules tend to “spread out” Requires no energy

Equilibrium When molecules are evenly spread throughout a space Homeostasis Movie starring Christian Bale called “Equilibrium”

Bell ringer: (write the question) The movement of particles from an area of high concentration to low is known as___________ Why is the cell membrane known as semipermeable? When molecules are evenly spread out this is known as_____________- How would you define a solution?

Osmosis The diffusion of water across a membrane The cell membrane is selectively permeable Watch the animation

Rule for Osmosis If the area outside the cell has more salt – then water will be sucked out of the cell

U - Tubes

Cells In Different Solutions "ISO" means the same

Hypo = less Cell may burst, or organelles called “contractile vacuoles” remove excess water

Hyper = more Cell will shrink or die, plants wilt Why is it dangerous to drink sea water? Why does pouring salt on a slug kill it?

Bell ringer: What is osmosis? In which direction does water move in when looking at different solutions? If a cell is placed in a hypertonic solution what do you expect to occur? If a cell is placed in a isotonic solution, what will happen to the cell?

Osmotic pressure The force that is produced by the net movement of water out of or into a cell

Passive Transport Requires no energy Diffusion & Osmosis Facilitated Diffusion – carrier proteins “help” molecules across the membrane

ACTIVE TRANSPORT Requires the cell to use energy Proteins or Pumps found in the membrane move materials across

Endocytosis Taking “in” large molecules by the cell Phagocytosis = “phood”, taking in food particles Pinocytosis = liquid substances

EXOCYTOSIS Removing large particles (waste) from the cell Stuff “exits” the cell Watch video at http://www.esnips.com/doc/2dad912f-9dcc-4936-89d9-1ae32c6125d2/Chapter-6---Endocytosis-and-Exocytosis Or McGraw Hill Site

Bell ringer (write the question) Provide two examples of active transport Which form of transport requires no energy? Phagocytosis takes in what molecules? What is the difference between endocytosis and exocytosis? Label the solutions to the right

Passive transport Aquaporins Water channel proteins that allow water to pass right through them’ The movement of water by facilitated diffusion plays a role in an extremely important biological process, the process of osmosis