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

19. The Blood Vessels

Introduction to Blood Vessels

Anatomy & Physiology

19. The Blood Vessels

Introduction to Blood Vessels

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Multiple Choice

A metarteriole is a vessel that:

connects an arteriole to a capillary bed

has the thickest walls of all blood vessels

is the main site of gas exchange in the circulatory system

carries blood directly from veins to arteries

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Verified step by step guidance

Step 1: Begin by understanding the structure and function of a metarteriole. A metarteriole is a type of blood vessel that serves as a transitional vessel between an arteriole and a capillary bed.

Step 2: Recall the role of arterioles in the circulatory system. Arterioles are small branches of arteries that lead to capillaries, and they regulate blood flow into the capillary beds.

Step 3: Understand the function of capillary beds. Capillary beds are networks of tiny blood vessels where gas exchange (oxygen and carbon dioxide) and nutrient exchange occur between blood and tissues.

Step 4: Eliminate incorrect options based on anatomical knowledge. For example, metarterioles do not have the thickest walls (arteries do), are not the main site of gas exchange (capillaries are), and do not carry blood directly from veins to arteries (this is not physiologically possible).

Step 5: Conclude that the correct answer is: 'connects an arteriole to a capillary bed,' as this aligns with the anatomical and physiological role of metarterioles in the circulatory system.