Everything you know about osmosis = … (keep a numbered list) Question of the Day 12-14

Objectives Describe how the structure of the plasma membrane allows it to function as a regulatory structure and/or protective barrier for a cell

Unit # 4 Test = Tuesday Dec. 21

Examples of passive transport =

Carrier proteins – Carrier proteins – proteins that assist facilitated diffusion proteins that assist facilitated diffusion

Ion channels – Ion channels – proteins transport ions from high concentration to lower concentration proteins transport ions from high concentration to lower concentration Ions like Na+, Ca+, etc are not soluble in lipids, so they must travel through proteins channels Ions like Na+, Ca+, etc are not soluble in lipids, so they must travel through proteins channels Ion channels are ion specific Ion channels are ion specific Some channels are always open, some have gate Some channels are always open, some have gate Gates open from stimuli: stretching of cell membrane electrical or chemical signals Gates open from stimuli: stretching of cell membrane electrical or chemical signals

Active Transport – Active Transport – transport of materials against a concentration gradient – requires energy transport of materials against a concentration gradient – requires energy ATP (adenosine tri-phosphate) – ATP (adenosine tri-phosphate) – the ENERGY molecule for the cell the ENERGY molecule for the cell Breaks down from ATP ADP (Adenosine di-phosphate) Breaks down from ATP ADP (Adenosine di-phosphate) Hydrolysis of the phosphate releases energy Hydrolysis of the phosphate releases energy Active Transport

Active Transport Example v=1ZFqOvxXg9M&feature=relat ed v=1ZFqOvxXg9M&feature=relat ed v=1ZFqOvxXg9M&feature=relat ed

In Lab: 1. What was the purpose of the vinegar? 2. What hypertonic solution did you put the egg in? 3. What did you use for a hypotonic solution? Question of the Day 12-13

Sodium-potassium Pump – Sodium-potassium Pump – transfer protein example transfer protein example Transfers Na+ out and K+ in Transfers Na+ out and K+ in Creates electrical gradient which is important for nerve impulses Creates electrical gradient which is important for nerve impulses hill.com/sites/ /student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html hill.com/sites/ /student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html hill.com/sites/ /student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html hill.com/sites/ /student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html

Na+ / K+ Pump

Endocytosis – Endocytosis – when a cell surrounds and takes in material from the environment when a cell surrounds and takes in material from the environment Uses ATP Uses ATP

Endocytosis

Pinocytosis – Pinocytosis – Transport of fluids into the cell Transport of fluids into the cell

Phagocytosis – Phagocytosis – Transfer of large particles / cells into the cell Transfer of large particles / cells into the cell Phagocytes – Phagocytes – Cells that ingest bacteria / viruses and lysosomes fuse w/ vesicle to destroy them before harm done Cells that ingest bacteria / viruses and lysosomes fuse w/ vesicle to destroy them before harm done

Exocytosis – Exocytosis – when a cell expels materials to the extracellular environment when a cell expels materials to the extracellular environment Cell exports proteins, hormones and wastes this way Cell exports proteins, hormones and wastes this way This process uses ___ATP___ This process uses ___ATP___

Endo / Exocytosis

Exocytosis and endocytosis Exocytosis and endocytosis sa4Y8 sa4Y8 sa4Y8 sa4Y8

The End

Warm Up 1-5 Draw and Label Each – hypotonic, hypertonic, isotonic, active transport, diffusion: (Blue circles = cells) Draw and Label Each – hypotonic, hypertonic, isotonic, active transport, diffusion: (Blue circles = cells) NaCl 25% NaCl 12% Sugar 10% NaCl 35% Sugar 5% NaCl 20% ATP used

Dialysis Tubing Lab Groups of two or three (NOT 4) Groups of two or three (NOT 4) Read through part 1 – create a flow chart of the procedure Read through part 1 – create a flow chart of the procedure

Warm Up 1-6 How is the dialysis tubing selective? How is the dialysis tubing selective? Get out your dialysis tubing lab. Get out your dialysis tubing lab.

Warm Up 1-6 Get you Part II lab set up Get you Part II lab set up Make your observations – finish lab questions Make your observations – finish lab questions Turn in your lab. Turn in your lab. Today: Today: Begin photosynthesis chapter Begin photosynthesis chapter

Warm Up 1-7 Get your Part II lab set up Get your Part II lab set up Make your observations Make your observations Finish the lab questions – Turn in Lab Finish the lab questions – Turn in Lab Today: Today: Start Photosynthesis!! Start Photosynthesis!!

Hypo / Hypertonic Solutions