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

2. Cell Chemistry & Cell Components

Introduction to the Cytoskeleton

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to the Cytoskeleton

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Multiple Choice

Which of the following structures has a 9 + 2 arrangement of microtubules?

Microvilli

Cilia

Actin filaments

Intermediate filaments

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Verified step by step guidance

Understand the structure of microtubules: Microtubules are cylindrical structures made of tubulin proteins. They are part of the cytoskeleton and play a role in cell shape, transport, and division.

Learn about the 9 + 2 arrangement: This refers to the specific arrangement of microtubules found in certain cellular structures. It consists of nine pairs of microtubules arranged in a circle around two central microtubules.

Identify structures with the 9 + 2 arrangement: The 9 + 2 arrangement is characteristic of cilia and flagella, which are hair-like structures that protrude from the surface of some cells and are involved in movement.

Differentiate between cilia and other structures: Microvilli, actin filaments, and intermediate filaments do not have the 9 + 2 arrangement. Microvilli are involved in increasing surface area for absorption, actin filaments are part of the cytoskeleton involved in cell movement and shape, and intermediate filaments provide mechanical support.

Conclude that cilia have the 9 + 2 arrangement: Based on the understanding of the structure and function of cilia, recognize that they are the correct answer to the problem, as they possess the 9 + 2 arrangement of microtubules.