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

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following are veins characterized by especially thin walls, large lumens, and a lack of smooth muscle?

Venous sinuses

Arterioles

Capillaries

Venules

Previous problemNext problem

Verified step by step guidance

Understand the structural differences between veins and other blood vessels. Veins are blood vessels that carry blood toward the heart, and they often have thinner walls compared to arteries due to lower blood pressure.

Learn the characteristics of venous sinuses. Venous sinuses are specialized veins with very thin walls, large lumens, and a lack of smooth muscle. They are designed to collect blood in specific areas, such as the coronary sinus in the heart or the dural venous sinuses in the brain.

Compare venous sinuses to other options provided in the question: Arterioles, Capillaries, and Venules. Arterioles are small arteries with thick walls and smooth muscle for regulating blood flow. Capillaries are microscopic vessels with thin walls but no large lumens, and they are involved in nutrient and gas exchange. Venules are small veins that do have smooth muscle and are not as specialized as venous sinuses.

Focus on the defining features of venous sinuses: thin walls, large lumens, and lack of smooth muscle. These features distinguish them from other types of blood vessels listed in the question.

Conclude that venous sinuses are the correct answer based on their unique structural characteristics, which match the description provided in the question.