Bell Work Respiration video on EDPUZZLE COM Due

Bell Work • Respiration video on EDPUZZLE. COM – Due Wednesday before class • Pick up graphic organizer and fill in as a class

Opening Joke

Cellular Respiration Mrs. Stewart

Standards: • CLE 3210. 3. 2 - Distinguish between aerobic and anaerobic respiration. • CLE 3210. 3. 3 - Investigate the relationship between the processes of photosynthesis and cellular respiration.

Objectives: • Distinguish between Anaerobic and Aerobic Respiration • Summarize the major events of Glycolysis, Krebs Cycle and ETC • Summarize the reactants and products of aerobic cellular respiration

Shoulder Partners

Redox Reactions: Oxidation and Reduction • The transfer of electrons during chemical reactions releases energy stored in organic molecules • This released energy is ultimately used to synthesize ATP Copyright © 2008 Pearson Education, Inc. , publishing as Pearson Benjamin Cummings

The Principle of Redox • Chemical reactions that transfer electrons between reactants are called oxidation-reduction reactions, or redox reactions • In oxidation, a substance loses electrons, or is oxidized • In reduction, a substance gains electrons, or is reduced (the amount of positive charge is reduced) Copyright © 2008 Pearson Education, Inc. , publishing as Pearson Benjamin Cummings

Fig. 9 -UN 1 becomes oxidized (loses electron) becomes reduced (gains electron)

Fig. 9 -UN 2 Label the reaction below correctly: __________

Oxidation of Organic Fuel Molecules During Cellular Respiration • During cellular respiration, the fuel (such as glucose) is oxidized, and O 2 is reduced: Copyright © 2008 Pearson Education, Inc. , publishing as Pearson Benjamin Cummings

Where does the energy we need come from?

Comparing Photosynthesis & Cellular Respiration Photosynthesis Cellular Respiration Type Anabolic Catabolic Energy Light Chemical ATP Location Chloroplasts Mitochondria Reactants CO 2 & H 2 O C 6 H 12 O 6 & O 2 Products C 6 H 12 O 6 & O 2 CO 2 & H 2 O Equation 6 CO 2 + 6 H 2 O --> C 6 H 12 O 6 + 6 O 2 --> 6 CO 2 + 6 H 2 O

Fig. 9 -2 Light energy ECOSYSTEM Photosynthesis in chloroplasts CO 2 + H 2 O Organic +O molecules 2 Cellular respiration in mitochondria ATP powers most cellular work Heat energy

Catabolic Pathways and Production of ATP • The breakdown of organic molecules is exergonic • Fermentation is a partial degradation of sugars that occurs without O 2 • Aerobic respiration consumes organic molecules and O 2 and yields ATP • Anaerobic respiration is similar to aerobic respiration but consumes compounds other than O 2 Copyright © 2008 Pearson Education, Inc. , publishing as Pearson Benjamin Cummings

• Cellular respiration includes both aerobic and anaerobic respiration but is often used to refer to aerobic respiration • Although carbohydrates, fats, and proteins are all consumed as fuel, it is helpful to trace cellular respiration with the sugar glucose: C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O + Energy (ATP + heat) Copyright © 2008 Pearson Education, Inc. , publishing as Pearson Benjamin Cummings

Occurs in two main stages: Anaerobic vs. Aerobic • No oxygen • Uses oxygen • Makes a little energy • Makes a lot of energy • Occurs in Cytoplasm • Occurs in Mitochondria

Who can do cellular respiration ?

Summary Equation for Aerobic Cellular Respiration Where did these reactants come from? Where will these products go? How will they be used?

Turtles • Tell your butterfly two ways that differentiate between photosynthesis and cellular respiration

Butterflies • Tell your turtle how photosynthesis and cellular respiration are similar and dependent on each other

What’s the purpose? • Purpose: To release energy from food molecules and make ATP! • Why do we need ATP? • To run chemical reactions that keep us alive and functioning.

Where did it all come from? C 6 H 12 O 6 • From Carbon Dioxide • From Water • From Carbon Dioxide

Hydrogen from Photosynthesis • The Hydrogen from photosynthesis holds high energy electrons that were energized in PS I • Cellular respiration releases those high energy electrons so that the energy can be captured and used to create ATP for the cell

Two possible pathways

Graphic Organizer of Events GLUCOSE Step 1: GLYCOLYSIS; (anaerobic) 2 - PYRUVATE CO 2 2 – ACETYL Co. A Step 2: KREBS CYCLE (aerobic) CO 2 Hydrogen Step 3: ETC (aerobic – oxygen is final electron acceptor!) ELECTRON TRANSPORT CHAIN WATER

Turtles • Tell your butterfly the three phases of cellular respiration and which ones require oxygen