Cellular Respiration

Chapter 9

Textbook Pages 220-239

Study Guide Pages 70-76

Looking Ahead…Today: Begin Cellular RespirationTomorrow: Glycolysis/FermentationFriday: Open notes quiz

Short class (due to assembly) Start work on Krebs cycleMonday: No SchoolTuesday: Finish Krebs cycle and electron

transportWednesday:Compare/Contrast Photosynthesis

and Cell Resp.Thurs & Fri: You’ll have a sub.

Who/What needs food?

PeopleAnimalsPlantsBacteriaFungiAll living things

Energy comes from Sugars (or complex starches)…

One gram of sugar can produce 3811 calories of heat energy

1000 calories of heat energy = 1 kilocalorie (labeled as Calorie with a capital “C” on our food products)

Pulling Energy from Sugar

How do organisms get energy from sugar?

Cellular Respiration!Occurs in the mitochondrionBegins with glycolysisFood is broken down in the presence of

oxygen!

What is Cellular Respiration?

The process that releases energy by breaking down food molecules in the presence of oxygen

6O2 + C6H12O6 6CO2 + 6H2O + energy

Oxygen + glucose carbon dioxide + water + energy

Steps of Cellular Respiration

Glycolysis (cytoplasm)

Krebs Cycle (mitochondria)

Electron Transport Chain (mitochondria)

Cell Resp.

Project…

Use the Handout to cut out the stages of Cellular Respiration.

Paste cycle on a piece of paper to put in your binder

Label cytoplasm and mitochondrionAdd arrowsMake it colorful and fun!

Daily Warm Up…The three stages of cellular respiration, in

order, are _________, ________, and __________.

The equation for cellular respiration is ___ + ___ _____ + _____ + ______

What are the reactants?What are the products?HOTS: Cellular respiration is called aerobic

respiration because _________ must be present as the final acceptor of electrons.

HOTS Higher Order Thinking Skills

HOTS: Cellular respiration is called aerobic respiration because oxygen must be present as the final acceptor of electrons.

**When you’re doing aerobics, you breathe more rapidly, because you need more oxygen!!**

GlycolysisProcess in which one molecule of glucose is

broken in half, producing 2 molecules of pyruvic acid

Using the jumper cables…

In order to get things going, 2 ATP molecules are used to “jump start” the glycolysis process

Once things get rolling…

Making energy…

Glycolysis can produce 4 ATP molecules and 2 NADH molecules

NADH works just like NADPH… think of it as the prison transport van… Each NAD+ can transport 2 high-energy

electrons, or “prisoners” and one H+ ion, or “prison guard”

Faster than driving on the Autobahn…

Glycolysis moves super fast…So fast, in fact, that the cell can produce

thousands of ATP molecules in just a few miliseconds!

Fermentation No oxygen around? Cells then rely on fermentation to release

energy from food. No oxygen = anaerobic NADH is converted to NAD+ by giving the 2 electrons and H+

ion to the pyruvic acid

2 Types of Fermentation:

Alcoholic fermentationYeast (bread)Some microorganismsPyruvic acid + NADH alcohol + CO2 + NAD+

Lactic acid fermentationWhy your muscles burn

sometimes when you exercisePyruvic acid + NADH lactic acid + NAD+