1 / 68

WARM UP: Tues, Oct 1

WARM UP: Tues, Oct 1. In your 3 brad folder: Define homeostasis in your own words. (Hint: look in cell theory notes). Cellular Processes Day 1. Objectives. 1. Define homeostasis. 2. Describe the Fluid Mosaic Model. 3. List items that enter & exit the cell. Homeostasis.

evania
Download Presentation

WARM UP: Tues, Oct 1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. WARM UP: Tues, Oct 1 • In your 3 brad folder: • Define homeostasis in your own words. (Hint: look in cell theory notes)

  2. Cellular Processes Day 1

  3. Objectives 1. Define homeostasis. 2. Describe the Fluid Mosaic Model. 3. List items that enter & exit the cell .

  4. Homeostasis = ability to maintain internal equilibrium • Maintain = keep • Internal = inside • Equilibrium = stable or balanced

  5. Why is maintaining homeostasis in our body & cells important? An imbalance = disease or death!

  6. Cell Membrane • Function: 1) Regulates what enters & exits cell 2) Provides protection & support

  7. Cell Membrane AKAs • AKA: Plasma Membrane • AKA: Phospholipid Bilayer • AKA: Fluid Mosaic Model

  8. Fluid Mosaic Model • Fluid = not solid, membrane moves • Mosaic = made of many parts

  9. Parts of a Plasma Membrane • Different Macromolecules in membrane: 1) Lipids = create bi-layer 2) Protein = create channel to pass large items 3) Carbohydrate Chains = identifying markers

  10. A Closer Look at the Cell Membrane Lipid Bi-Layer = 2 layers Phosphate head Fatty Tails

  11. Phospholipid Bilayer • Phospholipid = hydrophilic head + hydrophobic tail  BILAYER • Hydrophilic = water loving • Hydrophobic = water fearing • Water & Oil do not mix Latin Root: Bi = 2

  12. What Enters? • What the cell needs for survival • Nutrients • Water • Oxygen • Nucleic Acids (blueprint)

  13. What Exits? • What the cell needs to remove for survival (wastes) • Carbon Dioxide • Excess water • Urea • Other cellular wastes

  14. Membranes 1) Permeable = anything can cross 2) Impermeable = nothing can cross 3) Selectively Permeable= some substances can cross, but not others AKA Semipermeable ***Most membranes are selective***

  15. NO ENTRY ENTER Phospholipid Bilayer and maintaining homeostasis • Keep Balance = membrane selectively permeable

  16. Egg Lab: Day 1 Paste chart onto spare sheet of notebook paper you picked up at the door Write your name, date, and period at top right corner of notebook paper Hypothesis: I believe the egg shell will _______ with vinegar.

  17. Egg Lab: Day 2 Answer questions 1-2 in complete sentence Hypothesis Day 2: “ I believe…” - Will the syrup level go up or down? - Will the egg get larger or smaller?

  18. WARM UP: Wed, Oct 2 • In your 3 brad folder: • What is the difference between a permeable and impermeable membrane?

  19. Cellular Processes Day 2

  20. Objectives 1. Define diffusion & osmosis. 2. Explain the 3 types of osmosis. 3. Define osmotic pressure. 4. Predict the results of an osmotic lab experiment.

  21. How “things” get selected to come into and out of the cell… PASSIVE TRANSPORT DIFFUSION OSMOSIS

  22. DIFFUSION = movement of particlesfrom highto low - Goes w/ the crowd - w/ the concentration gradient • Does NOT require energy • Diffusion stops when 2 areas are EQUAL (homeostasis) Low High

  23. Facilitated Diffusion = movement larger molecules w/ “help” from protein channels • Does NOT require energy

  24. OSMOSIS = diffusion (movement) of water - From high to low - W/ the crowd - Does NOT require energy

  25. Solvent & Solute • Solvent = the liquid portion • i.e. the water in a salt water mixture • Solute = the part that is mixed in • i.e. the salt in a salt water mixture

  26. 3 Types of Osmosis • Hypertonic Solution = > (greater) concentration of solute outside the cell than inside - Cell Shrink Latin root: Hyper = over, more, higher

  27. 3 Types of Osmosis 2) Hypotonic Solution = < (lower) concentration of solute outside the cell than inside - Cell Burst Latin root: Hypo = under, less, lower

  28. 3 Types of Osmosis 3) Isotonic Solution = concentration solute outside = concentration inside - Cell stays the same

  29. Osmotic Pressure = pressure exerted on a cell membrane due to concentration gradient = different conc. on either side of the cell membrane

  30. Egg Lab: Day 2 Answer questions 1-2 in complete sentence Hypothesis Day 2: “ I believe…” - Will the syrup level go up or down? - Will the egg get larger or smaller?

  31. Egg Lab: Day 3 Answer questions 3-7 in complete sentences Hypothesis Day 3: “I believe…” Will the water level go up or down? Will the egg get larger or smaller?

  32. WARM UP: Thurs, Oct 3 • In your 3 brad folder: • What is the difference between a hypertonic solution & a hypotonic solution?

  33. Cellular Processes Day 3

  34. Objectives • Define active transport. • List the types of active transport. • Define concentration. 4. Predict the results of an osmotic lab experiment.

  35. Osmotic Pressure = pressure exerted on a cell membrane due to concentration gradient = different conc. on either side of the cell membrane

  36. Active Transport = movement of molecules against the concentration gradient ***Low to High*** • Against the crowd • REQUIRES energy • ATP = energy in cell ATP Requires Energy

  37. Endosytosis = take materials into cell Latin root: endo = inner

  38. Endosytosis • Type 1: Phagosytosis = engulf and ingest particles = “cell eating” • EX: white blood cells eating invading bacteria cells

  39. Endosytosis • Type 2: Pinocytosis = ingest extracellular fluid & its contents = “cell drinking” • EX: human egg cells drinking nutrients from surrounding cells while maturing in ovary

  40. Exosytosis • = cell releases materials to the outside • - discharge as membrane-bounded vesicles • - pass through the cell membrane • = “out of the cell” • Latin root: Ex = outer, away from

  41. Egg Lab: Day 3 Answer questions 3-7 in complete sentences Hypothesis Day 3: “I believe…” Will the water level go up or down? Will the egg get larger or smaller?

  42. WARM UP: Fri, Oct 4 • In your 3 brad folder: • Define the term equilibrium

  43. Egg Lab: Day 4 - Answer questions 8-12 in complete sentences

  44. Friday, Oct 4 • Periods 1, 2, & 5 = Cell Process worksheets

  45. WARM UP: Mon, Oct 7 • In your 3 brad folder: • What are the 3 macromolecules found in the plasma membrane?

  46. WARM UP: Wed, Oct 9 • In your 3 brad folder: What type of active transport is shown in this diagram?

  47. Cellular Processes Day 4

  48. Objectives 1. Describe the difference between positive (+) and negative (-) feedback. 2. Define solution & concentration 3. Define concentration gradient.

  49. Solution & Concentration Solution = mixture 2+ substances Concentration = amount of substance (solute) in liquid (solvent) • Cytoplasm = one concentration • Outside of cell = another concentration *** Want balance (homeostasis)***

  50. Concentration • Concentration gradient= unequal distribution on either side of a membrane • Equilibrium = concentration same on both sides of cell

More Related