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

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

Which of the following structures is a remnant of fetal circulation that is present after birth?

Superior vena cava

Pulmonary trunk

Aortic arch

Ligamentum arteriosum

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Verified step by step guidance

Understand the context: Fetal circulation includes structures that allow blood to bypass the lungs, as the fetus does not use its lungs for oxygen exchange. After birth, these structures are no longer needed and transform into remnants.

Identify the structure in question: The ligamentum arteriosum is a remnant of the ductus arteriosus, a fetal blood vessel that connects the pulmonary trunk to the aortic arch, allowing blood to bypass the lungs during fetal development.

Recognize the transformation: After birth, the ductus arteriosus closes due to changes in pressure and oxygen levels, forming the ligamentum arteriosum, a fibrous band.

Differentiate from other options: The superior vena cava, pulmonary trunk, and aortic arch are not remnants of fetal circulation; they are functional structures in both fetal and postnatal circulation.

Conclude: The ligamentum arteriosum is the correct answer because it is a postnatal remnant of the ductus arteriosus, a key component of fetal circulation.