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 body structure encounters both inhaled air and ingested food and drink?

Esophagus

Pharynx

Larynx

Trachea

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Verified step by step guidance

Understand the function of each structure listed in the problem: The esophagus is a muscular tube that transports food and drink to the stomach, but it does not encounter inhaled air. The larynx is involved in voice production and air passage but does not interact with ingested food or drink. The trachea is the windpipe that carries air to the lungs and does not interact with food or drink.

Recognize that the pharynx is a shared anatomical region that serves as a passageway for both the respiratory and digestive systems. It encounters inhaled air as it moves toward the larynx and trachea, and ingested food and drink as they move toward the esophagus.

Break down the anatomy of the pharynx: It is divided into three regions—nasopharynx (air passage only), oropharynx (shared passage for air, food, and drink), and laryngopharynx (shared passage leading to the esophagus and larynx). Focus on the oropharynx and laryngopharynx as the areas where both air and ingested substances pass.

Consider the physiological processes: When swallowing, the epiglottis closes over the larynx to prevent food and drink from entering the respiratory tract, ensuring that they are directed toward the esophagus. This highlights the pharynx's dual role in both systems.

Conclude that the pharynx is the correct answer because it is the only structure listed that encounters both inhaled air and ingested food and drink, serving as a shared pathway for these substances.