Word Bank 2 Acetyl-CoA 2 ATP 2 ATP 34 ATP 2-€02 4 CO₂ Electron transport chain 2 FADH₂ Fermentation Glucose Glycolysis Krebs cycle Lactic Acid 2 NADH -2 NADH 6 NADH NAD+ 2-Pyruvate Cellular Respiration Fermentation begins with Glucose which is broken down during Glycolysis which produces 2 Pyruvate In the absence of 0₂ can be used in 2ATP yielding a net gain of 2 NADH In the presence of O₂ can be used to produce +

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Cellular Respiration Overview**

Cellular respiration begins with **glucose**, which is broken down during **glycolysis**. This process yields a net gain of **2 ATP** and **2 NADH**, producing **2 pyruvate** molecules.

- **In the absence of O₂ (oxygen):**
  - Pyruvate is used in **fermentation**.
  - Fermentation produces **lactic acid** and regenerates **NAD⁺**.

- **In the presence of O₂ (oxygen):**
  - Pyruvate is used to produce **2 Acetyl-CoA**.
  - This process releases **2 CO₂** and generates **2 NADH**.

The Acetyl-CoA molecules then enter the **Krebs cycle**, which has a net yield of:
- **2 ATP**
- **4 CO₂**
- **2 FADH₂**
- **6 NADH**

These products are used in the **electron transport chain**, producing approximately **34 ATP**.
Transcribed Image Text:**Cellular Respiration Overview** Cellular respiration begins with **glucose**, which is broken down during **glycolysis**. This process yields a net gain of **2 ATP** and **2 NADH**, producing **2 pyruvate** molecules. - **In the absence of O₂ (oxygen):** - Pyruvate is used in **fermentation**. - Fermentation produces **lactic acid** and regenerates **NAD⁺**. - **In the presence of O₂ (oxygen):** - Pyruvate is used to produce **2 Acetyl-CoA**. - This process releases **2 CO₂** and generates **2 NADH**. The Acetyl-CoA molecules then enter the **Krebs cycle**, which has a net yield of: - **2 ATP** - **4 CO₂** - **2 FADH₂** - **6 NADH** These products are used in the **electron transport chain**, producing approximately **34 ATP**.
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