Respiration Cellular respiration is the process that releases energy by breaking down glucose and...

Respiration

Cellular respiration is the process that releases energy by breaking down glucose and other food molecules in the presence of oxygen.

Oxygen+ glucose->carbon dioxide+ water

GlucoseGlycolysis

Cytoplasm

Pyruvic acid

Electrons carried in NADH

Krebs Cycle

Electrons carried in

NADH and FADH2 Electron

Transport Chain

Mitochondrion

Figure 9–2 Cellular Respiration: An Overview

Mitochondrion

Section 9-1

Glycolysis takes place in cytoplasm

Glycolysis is the process in which one molecule of glucose is broken in half, producing two molecules of pyruvic acid.

Two ATP molecules are needed as activation energy to produce 4 ATP molecules and 2 NADH molecules

Glucose

To the electron transport chain

Figure 9–3 Glycolysis

Section 9-1

2 Pyruvic acid

Glucose

To the electron transport chain

Figure 9–3 Glycolysis

Section 9-1

2 Pyruvic acid

Glucose

Glycolysis Krebs cycle

Electrontransport

Fermentation (without oxygen)

Alcohol or lactic acid

Chemical Pathways

Section 9-1

Glucose

To the electron transport chain

Figure 9–3 Glycolysis

Section 9-1

2 Pyruvic acid

Glucose Pyruvic acidLactic acid

Figure 9–4 Lactic Acid Fermentation

Section 9-1

Fermentation

When oxygen is not present, fermentation occurs. Fermentation releases energy from food by producing ATP with out oxygen.

There are two types of fermentation Alcoholic and Lactic Acid

Glucose Pyruvic acidLactic acid

Figure 9–4 Lactic Acid Fermentation

Section 9-1

Glucose Pyruvic acidLactic acid

Figure 9–4 Lactic Acid Fermentation

Section 9-1

FlowchartSection 9-2

Glucose(C6H1206)

+Oxygen

(02)

GlycolysisKrebsCycle

ElectronTransport

Chain

Carbon Dioxide

(CO2)+

Water(H2O)

Cellular Respiration

Krebs Cycle

Krebs cycle occurs in the mitochondria and in the presence of oxygen pyruvic acid ( from glycolysis) is broken down into carbon dioxide.

Through a series of chemical reactions citric acid is formed and enters the krebs cycle (citric acid) to producing oxygen, ATP and NADH

Citric Acid Production

Figure 9–6 The Krebs Cycle

Section 9-2

Mitochondrion

Citric Acid Production

Figure 9–6 The Krebs Cycle

Section 9-2

Mitochondrion

Electron Transport Chain

Figure 9–7 Electron Transport Chain

Section 9-2

Electron TransportHydrogen Ion Movement

ATP Production

ATP synthase

Channel

Inner Membrane

Matrix

Intermembrane Space

Mitochondrion