Table of contents

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

Krebs Cycle

Anatomy & Physiology

3. Energy & Cell Processes

Krebs Cycle

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Multiple Choice

The citric acid cycle requires which of the following three molecules as inputs?

Glucose, ADP, and NADP+

Pyruvate, ATP, and NADH

Lactate, CoA, and GTP

Acetyl-CoA, NAD+, and FAD

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Verified step by step guidance

Understand the role of the citric acid cycle, also known as the Krebs cycle, in cellular respiration. It is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.

Identify the primary inputs required for the citric acid cycle. The cycle begins with the combination of acetyl-CoA with oxaloacetate to form citrate, which is then metabolized through a series of steps.

Recognize that acetyl-CoA is the main substrate that enters the citric acid cycle. It is derived from pyruvate, which is produced from glucose during glycolysis, and then converted to acetyl-CoA.

Understand the role of NAD+ and FAD as electron carriers. During the cycle, these molecules are reduced to NADH and FADH2, respectively, as they accept electrons. These reduced forms are then used in the electron transport chain to generate ATP.

Note that the correct inputs for the citric acid cycle are acetyl-CoA, NAD+, and FAD, as they are essential for the cycle's function in energy production.