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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1:35 minutes

Problem 18

Textbook Question

Microvilli are found
(a) Mostly in muscle cells
(b) On the inside of plasma membranes
(c) In large numbers on cells that secrete hormones
(d) In cells that are actively engaged in absorption
(e) Only on cells lining the reproductive tract

Verified step by step guidance

Understand the function of microvilli: Microvilli are small, finger-like projections on the surface of certain cells that increase the surface area for absorption or secretion. They are particularly important in cells that require efficient nutrient uptake or exchange of substances.

Recall the types of cells where microvilli are commonly found: Microvilli are abundant in cells that are actively engaged in absorption, such as epithelial cells lining the intestines and kidney tubules. These cells need a large surface area to absorb nutrients and other substances effectively.

Eliminate incorrect options: (a) Muscle cells do not have microvilli because their primary function is contraction, not absorption. (b) Microvilli are located on the external surface of the plasma membrane, not inside it. (c) Cells that secrete hormones typically do not have microvilli, as their function is secretion rather than absorption. (e) Microvilli are not exclusive to cells lining the reproductive tract.

Focus on the correct option: Cells actively engaged in absorption, such as intestinal epithelial cells, are equipped with microvilli to maximize their ability to absorb nutrients and other substances.

Conclude that the correct answer is related to absorption: Microvilli are specialized structures that enhance the absorptive capacity of cells, making option (d) the most accurate choice.

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Key Concepts

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

Microvilli Structure and Function

Microvilli are tiny, finger-like projections that extend from the surface of epithelial cells, primarily found in areas where absorption is critical, such as the intestines. They increase the surface area of the cell, enhancing its ability to absorb nutrients and other substances. This structural adaptation is essential for efficient nutrient uptake.

Epithelial Tissue

Epithelial tissue is a type of tissue that lines the surfaces of organs and structures throughout the body. It plays a crucial role in absorption, secretion, and protection. Microvilli are predominantly found on the apical surface of epithelial cells, particularly in tissues involved in absorption, such as the intestinal lining.

Absorption Mechanisms

Absorption mechanisms refer to the processes by which cells take in substances from their environment. In the context of microvilli, these mechanisms are vital for the uptake of nutrients, ions, and water. Cells with microvilli are specialized for high rates of absorption, making them essential in organs like the small intestine.

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Which of the following statements about the cytoskeleton is correct?

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Which statement about the cytoskeleton is true?

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