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

19. The Blood Vessels

General Blood Vessel Structure

Anatomy & Physiology

19. The Blood Vessels

General Blood Vessel Structure

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Problem 18.3aErin C. Amerman - 2nd Edition

Textbook Question

Collagen vascular diseases weaken the collagen in the tunica externa of blood vessels. Predict the effects of such a disease.

Verified step by step guidance

Understand that the tunica externa, also known as the adventitia, is the outermost layer of a blood vessel, composed mainly of collagen fibers that provide structural support and protection.

Recognize that collagen is a key protein that provides strength and elasticity to the blood vessel walls, helping them withstand the pressure of blood flow.

Consider that collagen vascular diseases can lead to a weakening of the collagen fibers, which may result in reduced structural integrity of the blood vessels.

Predict that weakened collagen in the tunica externa could lead to increased risk of blood vessel dilation or aneurysm, as the vessel walls may not be able to maintain their shape under pressure.

Anticipate potential complications such as increased susceptibility to vessel rupture or hemorrhage, due to the compromised strength and elasticity of the blood vessel walls.

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Key Concepts

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

Collagen Structure and Function

Collagen is a primary structural protein in the body, providing strength and support to various tissues, including blood vessels. It forms a fibrous network that helps maintain the integrity and elasticity of the tunica externa, the outer layer of blood vessels. Weakening of collagen due to diseases can lead to compromised vessel structure and function.

Tunica Externa

The tunica externa, or adventitia, is the outermost layer of blood vessels, composed mainly of connective tissue that includes collagen fibers. This layer provides structural support and protection to the blood vessels. When collagen is weakened, the tunica externa may become less resilient, increasing the risk of vessel rupture or dilation.

Effects of Collagen Vascular Diseases

Collagen vascular diseases, such as Ehlers-Danlos syndrome or systemic lupus erythematosus, can lead to a range of vascular complications. These may include increased fragility of blood vessels, susceptibility to aneurysms, and impaired blood flow. Understanding these effects is crucial for predicting potential health risks associated with weakened collagen in the vascular system.