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

In both pulmonary and systemic circulation, gas exchange occurs at the:

heart valves

arteries

capillaries

veins

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Verified step by step guidance

Understand the concept of gas exchange: Gas exchange refers to the process where oxygen is transferred from the blood to the tissues and carbon dioxide is transferred from the tissues to the blood. This occurs at the level of capillaries, which are the smallest blood vessels in the circulatory system.

Review the structure of the circulatory system: The circulatory system is divided into pulmonary circulation (blood flow between the heart and lungs) and systemic circulation (blood flow between the heart and the rest of the body). Both systems rely on capillaries for gas exchange.

Identify the role of capillaries: Capillaries are thin-walled blood vessels that allow for the diffusion of gases, nutrients, and waste products between the blood and surrounding tissues. Their structure is specifically adapted for efficient exchange.

Eliminate incorrect options: Heart valves regulate blood flow within the heart, arteries transport blood away from the heart, and veins return blood to the heart. None of these structures are involved in direct gas exchange.

Conclude that capillaries are the correct answer: Capillaries are the site of gas exchange in both pulmonary and systemic circulation, making them the correct choice for this question.