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

One thing you know about active transport = ??? Question of the Day 12-15

Unit # 4 Test = Tuesday Dec. 21

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

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

First = make up Second = extra credit – complete the graphic organizer for chapter 5 of the online textbook – when you get it correct, raise your hand and show me Make up and E.C My.hrw.com Chapter 4 Username = dhe5n Password = p5e8n