12172021 Title Biology 111006 Objectives To complete the

12/17/2021 Title: Biology 11/10/06 Objectives: To complete the eggsperiment, assess knowledge gained about passive transport and learn about active transport. Class Topics • Hand in W. S. “Homeostasis and transport” before the bell rings • • Chapter 4 Quiz 1 Notes – Chapter 4 – Please do not hand in the lab “Eggsperiment” – Active Transport “Man’s mind stretched to a new idea never goes back to its original dimensions. ” Oliver Wendell Holmes Friday, December 17, 2021 8: 22 PM 1

12/17/2021 Miscellaneous • Do not assume I will be available for help after school – Before school I will still be available • If I’m not in my room, check other places! – I will be available during homeroom – Check with me about after school time • Review times can be arranged ahead of time 2

12/17/2021 Eggsperiment 1. Determine a range for the percentage of water and the percentage of solute in your egg. – Explain how you determined this 2. Write a description of how you could find the exact percentage of water and solute in your egg. Hand in the ‘Eggsperiment’ 3

12/17/2021 Class Assignments What • • Eggsperiment 11/10/06 W. S. “Homeostasis and transport” Chapter 4 Quiz 1 11/10/06 W. S. 4. 2 (DR/Quiz) 11/14/06 By When 11/10/06 • Due this class period • Due next class period • Due in the future 4

12/17/2021 Grade Sheet 1 A – SR p. 61 - 5 pts Measurement W. S. – 10 pts 2 A – Measurement W. S. – 10 pts 3 A SR p. 42 – 6 pts 4 A – SR p. 47 – 5 pts 5

12/17/2021 Postquiz Activities • Hand in quiz • Pick up “Active Transport” handout • Read 81 -86 6

12/17/2021 Ion Channels (a type of facilitated diffusion) • Transport proteins have polar channels for the important ions to pass • Na+, K+, Ca 2+, and Cl • Fig 3 • Used in maintaining electrical charge or nerve cells 7

12/17/2021 Passive transport Osmosis Facilitated diffusion Diffusion of water High to low Concentration Transport protein Diffusion High to low concentration Water, carbon dioxide, oxygen Hypotonic Hypertonic Isotonic Glucose into cells Ion channels 8

12/17/2021 Active Transport • Using energy to move particles across the cell membrane - through an transport protein (pump) • Usually against the concentration gradient - like going up a hill • Ex. glucose into liver and muscle cells for storage – from a low concentration in the bloodstream to a high concentration in the cells 9

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12/17/2021 Sodium-Potassium Pump figure 5 • Found in nerve cells – Pumps 3 Na+ out of the cell and 2 K+ into the cell • Both against their concentration gradient 11

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12/17/2021 From: http: //www. accessexcellence. org/RC/VL/GG/pass. Active. Trans. html 13

12/17/2021 Bulk Transport • Also known as cytosis • Uses cell energy (active transport) • Moving large particles - larger than integral proteins - into or out of the cell – Endocytosis – into the cell – Exocytosis- out of the cell 14

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12/17/2021 From: http: //www. emc. maricopa. edu/faculty/farabee/BIOBK/Bio. Booktransp. html 16

12/17/2021 Exocytosis • Excretion – release waste • Secretion – release products • enzymes, carbohydrates, or hormones made by the cell 17

12/17/2021 Membrane Receptor Proteins • Signal molecules bind to receptor proteins and causes a change in the cell 1. Changes in permeability – Open ion channel – Activates another protein inside the cell – Speeds up a reaction (heroin) 2. Second messengers 3. Enzyme action 18

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12/17/2021 Active transport Low to high concentration cytosis Transport protein endocytosis Glucose into muscle cells Sodium potassium pump exocytosis Into cells Out of cells Secretion Excretion 20