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1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

3. Energy & Cell Processes

Pyruvate Oxidation

Anatomy & Physiology

3. Energy & Cell Processes

Pyruvate Oxidation

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Multiple Choice

In preparing pyruvate to enter the citric acid cycle, which of the following steps occurs?

Pyruvate is reduced, and a molecule of carbon dioxide is removed. The electrons removed in this process are used to oxidize NAD⁺ to NADH.

Pyruvate is oxidized, and a molecule of carbon dioxide is removed. The electrons removed in this process are donated to NADH to produce NAD⁺.

Pyruvate is reduced to acetyl-coA, which involves the reduction of pyruvate, the addition of a carbon dioxide from the environment, and its reduction by NADH.

Pyruvate is ionized directly to acetyl-coA.

Pyruvate is oxidized, and a molecule of carbon dioxide is removed. The electrons removed in this process are used to reduce NAD⁺ to NADH.

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Verified step by step guidance

Understand the role of pyruvate in cellular respiration. Pyruvate is a key intermediate that links glycolysis to the citric acid cycle.

Recognize that pyruvate undergoes a transformation before entering the citric acid cycle. This transformation is known as oxidative decarboxylation.

Identify the process of oxidative decarboxylation. Pyruvate is oxidized, meaning it loses electrons, and a molecule of carbon dioxide is removed from it.

Learn about the role of NAD+ in this process. The electrons removed from pyruvate are used to reduce NAD+ to NADH, which is an important electron carrier in cellular respiration.

Understand the outcome of this transformation. The oxidation of pyruvate results in the formation of acetyl-CoA, which then enters the citric acid cycle to continue the process of energy production.