1 Cell Membrane controls Homeostasis ___________It balances the ___________ and _________ of the cell. ___________ is maintained by plasma membrane controlling what _______ and _________ the cell

2 1.__________2.________ 3._________ 4.________________ Membrane Components

3 LABEL THE STRUCTURES

4Phospholipids Make up the cell membrane Contains ____ fatty acid chains called the _____ Contains _____ glycerol called the _____.

5 ___________ Heads are ___________ “water loving” ___________ Tails are ___________ “water fearing” Cell Membrane Makes membrane “_______” in what crosses

6 Cell Membrane __________ molecules pass ______; hydrophilic _________ _______________ The cell membrane is made of 2 layers of _______________ called the ________ ___________

7 ________ molecules and _________ hydrophobic molecules move through easily.e.g. ______, ______, _______ Semipermeable Membrane

8 ______, _________ molecules larger than water, and large molecules such as _______ do not move through the membrane on their own. Semipermeable Membrane

9 Simple Diffusion _____ ________.Requires _____ ________. _____________Molecules move from area of _____________ concentration

Diffusion Two things need to happen in a cell in order for diffusion to occur… what are they? 10 1.Cell membrane must be _______ to that substance. 2.There must be a ___________ ________ (needs to be higher in one area and move to lower area)

11 DIFFUSION ____________ Diffusion is a ____________ process which means no energy is used to make the molecules move, they have a _________ ENERGY

12 Diffusion of Liquids

Sugar Cube Diffusion 13

14 Diffusion through a Membrane Cell membrane Solute moves ________ concentration gradient (__________ to __________)

15 Osmosis Diffusion of ___________ across a membraneDiffusion of ___________ across a membrane Moves from ______ water potential (low solute) to _____ water potential (high solute)Moves from ______ water potential (low solute) to _____ water potential (high solute)

16 Diffusion of H 2 O Across A Membrane (Osmosis) 1. The left side concentration is what? 2.The right side concentration is what? So which way does water move?

3 Types of Osmosis: 17 1._____________: the solute and water concentration is the same inside the cell as it is outside the cell 2.___________: Higher concentration outside the cell than inside the cell. 3.___________: Higher concentration inside the cell than outside the cell.

18 Cell in Isotonic Solution What is the direction of water movement? The cell is in _______________. CELL 10% NaCL 90% H 2 O 10% NaCL 90% H 2 O ENVIRONMENT

19 Cell in Hypotonic Solution What is the direction of water movement? CELL 10% NaCL 90% H 2 O 20% NaCL 80% H 2 O

20 Cell in Hypertonic Solution What is the direction of water movement? CELL 15% NaCL 85% H 2 O 5% NaCL 95% H 2 O ENVIRONMENT

21 Cells in Solutions

22 Isotonic Solution Hypotonic Solution Hypertonic Solution

23 What will happen?

How does this relate to Anatomy? Discuss at your table this question and appoint someone to share your answer: What would happen to your blood cells if the fluid surrounding them had too much salt? 24

What Happens to Blood Cells? 25

26 Osmosis in Red Blood Cells _______ _______ ________

27

28 3 Types of Transport: 1._______ ________ (also includes osmosis) 2._________ Diffusion 3.__________ ________

Passive Transport vs. Active Transport Passive means: Active means: Which type(s) are passive? Which type(s) are active?

30 Three Forms of Transport Across the Membrane

31 Passive Transport Facilitated diffusion  _______ require energy  Uses _______ ______ to move _____ to _____ concentration Examples: ______ or __________ moving from blood into a cell.

32 2 Types of Transport Proteins In Facilitated Diffusion- the molecules are _________ and need “______” or to be facilitated across.

33 Facilitated Diffusion copyright cmassengale 1. _____________ are embedded in the cell membrane & have a pore for materials to cross

34 Facilitated Diffusion They bond and drag molecules through the lipid bilayer and release them on the opposite side.They bond and drag molecules through the lipid bilayer and release them on the opposite side. 2._____________ can change shape to move material from one side of the membrane to the other

35 Active Transport  Requires ________ or ______.  Moves materials from _______ to ________ concentration  _____________ concentration gradient

36 Active transport  Examples: Any Ions: Pumping _____ (sodium ions) out and _____ (potassium ions) in.  This happens in your Nervous System!

37 Moving the “Big Stuff” _________ molecules move materials into the cell by one of TWO forms of ________________ _________ molecules move materials into the cell by one of TWO forms of ________________.

38______________ Sometimes called “______ ________” Takes in dissolved molecules as a vesicle Takes in dissolved molecules as a vesicle.

39 Pinocytosis Called cell drinking because once in the cell materials dissolve in water to be used by the cellCalled cell drinking because once in the cell materials dissolve in water to be used by the cell

40 Endocytosis – ___________ Used to engulf large particles such as ______, _________, etc. into vesicles Called “_________ __________”

41 Moving the “Big Stuff” Molecules are moved out of the cell by vesicles that fuse with the plasma membrane. Exocytosis This is how many _________ are secreted and how ____________ communicate with one another This is how many _________ are secreted and how ____________ communicate with one another.