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

Why are the Krebs cycle and the electron transport chain (ETC) considered aerobic processes?

They require oxygen as the final electron acceptor in the electron transport chain.

They directly use oxygen to break down glucose into pyruvate.

They produce ATP only in the presence of carbon dioxide.

They both occur in the cytoplasm where oxygen is abundant.

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Verified step by step guidance

Understand that the Krebs cycle and the electron transport chain (ETC) are part of cellular respiration, a process that cells use to generate energy in the form of ATP.

Recognize that the Krebs cycle occurs in the mitochondria and involves a series of reactions that produce electron carriers (NADH and FADH2) by oxidizing acetyl-CoA derived from carbohydrates, fats, and proteins.

Identify that the electron transport chain (ETC) is a series of protein complexes located in the inner mitochondrial membrane that uses electrons from NADH and FADH2 to create a proton gradient across the membrane.

Clarify that oxygen is essential in the ETC as the final electron acceptor. Without oxygen, the electrons would not be able to move through the chain, and the proton gradient necessary for ATP synthesis would not be established.

Conclude that both the Krebs cycle and the ETC are considered aerobic processes because they rely on oxygen to ultimately accept electrons and facilitate the production of ATP, highlighting the role of oxygen in maintaining the flow of electrons and the generation of energy.