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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Problem 1

Textbook Question

Where does the citric acid cycle occur in eukaryotes?a. in the cytosol of cellsb. in the intermembrane space of mitochondriac. in the inner membrane of mitochondriad. 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 Location

The citric acid cycle, also known as the Krebs cycle, occurs in the matrix of mitochondria in eukaryotic cells. This is the innermost compartment of the mitochondria, where enzymes and substrates necessary for the cycle are present, allowing for efficient energy production through the oxidation of acetyl-CoA.

Mitochondrial Structure

Mitochondria have a double-membrane structure consisting of an outer membrane and an inner membrane, which encloses the matrix. The inner membrane is highly folded into structures called cristae, increasing surface area for biochemical reactions, while the matrix contains enzymes for the citric acid cycle and other metabolic processes.

Eukaryotic Cellular Respiration

In eukaryotes, cellular respiration involves multiple stages, including glycolysis, the citric acid cycle, and oxidative phosphorylation. The citric acid cycle plays a crucial role in breaking down carbohydrates, fats, and proteins to produce ATP, NADH, and FADH2, which are essential for energy transfer within the cell.