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Cellular RespirationCellular Respiration

Unit 2: CellsChapter 9-1

Learning Goals

1. Explain the process of cellular respiration including the equation with reactants and products.

2. Describe the 3 steps for cellular respiration including location, reactants and products, and amount of ATP produced.

3. Draw the mitochondria and label its parts.

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Cellular RespirationCellular Respiration

• Mitochondria break down food break down food (glucose) (glucose) molecules to make ATP ATP

– ATPATP will provide energy for other processes

• Occurs in the mitochondriaOccurs in the mitochondria• The Chemical Equation

CC66HH1212OO66 + 6 O + 6 O2 2 6 CO 6 CO22 + 6 H + 6 H22O + O + energyenergyGlucose + Oxygen Glucose + Oxygen Carbon dioxide + Water + Carbon dioxide + Water + EnergyEnergy

Flow Map

• Here is the chemical equation:

• CC66HH1212OO66 + 6 O + 6 O2 2 6 CO 6 CO22 + 6 H + 6 H22O + O + energyenergy

• From MEMORY (without using your From MEMORY (without using your notes), write out the word equation notes), write out the word equation and draw pictures to complete the and draw pictures to complete the picture equation.picture equation.

• You WILL need to memorize this You WILL need to memorize this equation as well as the photosynthesis equation as well as the photosynthesis equation so practice (quiz yourselves)equation so practice (quiz yourselves)2007-08

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MitochondriaMitochondria• Outer membraneOuter membrane = outside of

mitochondria• Inner membraneInner membrane = wavy inner layer

– CristaeCristae = folds of the inner membrane– MatrixMatrix = the space within the inner

membrane

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Overview: 3 steps 1. Glycolysis2. Krebs Cycle 3. Electron Transport Chain (ETC)

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1. Glycolysis1. Glycolysis• GlucoseGlucose split into two pyruvate

– AnaerobicAnaerobic = no oxygen is required

• Takes place in the Takes place in the cytoplasm cytoplasm (outside (outside mitochondria)mitochondria)

• 22 ATPsATPs are made

2 ATP

Glucose(6 carbons)

2 Pyruvates(3 carbons)

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Glycolysis: takes place in the cytoplasm

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2. Krebs Cycle2. Krebs Cycle• Pyruvate broken into COPyruvate broken into CO22

• NADH & FADH2 are made (stored energy)

• Occurs in the matrixmatrix of the mitochondria.

• 22 ATP’s ATP’s are made

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Kreb’s Cycle: occurs in the mitochondria’s matrix

Matrix

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3. Electron Transport Chain 3. Electron Transport Chain (ETC)(ETC)

• Most of the ATP energy of cellular Most of the ATP energy of cellular respiration is made by the ETCrespiration is made by the ETC

– Energy from NADH & FADH2 pumps H+ across the cristae, helping make ATP

• AerobicAerobic = oxygen is required– OO22 accepts the H+ at the end of the ETC

to make HH22OO

+

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• Occurs in the Occurs in the cristaecristae of the of the mitochondria.mitochondria.

• About About 32 ATPs 32 ATPs are made!!!are made!!!Electron Transport Chain:

occurs in the mitochondria’s cristae

Cristae: Inner Membrane

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•Cellular Cellular Respiration:Respiration:

•Total amount of ATP Total amount of ATP made from made from

1 glucose = 36 ATP’s1 glucose = 36 ATP’s

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FermentationFermentation

• Anaerobic RespirationAnaerobic Respiration: releases energy from food when O2 is notnot available.

• Allows for the cell to continue making a smallsmall amount of ATP.– Produces 2 ATP per 1 glucose

molecule

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Fermentation v. RespirationFermentation v. Respiration

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Comparing Photosynthesis Comparing Photosynthesis and Cellular Respirationand Cellular Respiration

Learning Goals

1. Explain the process of cellular respiration including the equation with reactants and products.

2. Describe the 3 steps for cellular respiration including location, reactants and products, and amount of ATP produced.

2007-08