Table of contents

1. Introduction to Anatomy & Physiology5h 40m
2. Cell Chemistry & Cell Components12h 37m
3. Energy & Cell Processes10h 7m
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 Blood1h 22m
18. The Heart1h 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 Balance Coming soon
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity Coming soon

3. Energy & Cell Processes

Krebs Cycle

Anatomy & Physiology

3. Energy & Cell Processes

Krebs Cycle

Problem 1b

Textbook Question

Where does the citric acid cycle occur in eukaryotes? a. in the cytosol of cells b. in the intermembrane space of mitochondria c. in the inner membrane of mitochondria d. in the matrix of mitochondria

Verified step by step guidance

Identify the location of the citric acid cycle within the cell.

Recall that the citric acid cycle is a key metabolic pathway that completes the breakdown of glucose derivatives.

Understand that the citric acid cycle occurs in a specific part of the mitochondria in eukaryotic cells.

Consider the structure of the mitochondria, which includes the outer membrane, intermembrane space, inner membrane, and matrix.

Determine that the citric acid cycle takes place in the matrix of the mitochondria, where enzymes and substrates are available for the cycle's reactions.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Citric Acid Cycle (Krebs Cycle)

The citric acid cycle, also known as the Krebs cycle, is a series of chemical reactions used by all aerobic organisms to generate energy. It plays a crucial role in cellular respiration by oxidizing acetyl-CoA to produce ATP, NADH, and FADH2, which are essential for energy production.

Mitochondrial Structure

Mitochondria are double-membraned organelles found in eukaryotic cells, responsible for energy production. They consist of an outer membrane, an inner membrane, and an intermembrane space, with the matrix being the innermost compartment where the citric acid cycle occurs.

Location of the Citric Acid Cycle

In eukaryotic cells, the citric acid cycle occurs in the mitochondrial matrix. This location is critical as it provides the necessary environment and enzymes for the cycle to efficiently convert acetyl-CoA into energy-rich molecules, which are then utilized in the electron transport chain.