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 structure delivers air directly to each lung in the human respiratory system?

Alveolus

Larynx

Primary bronchus

Trachea

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Verified step by step guidance

Step 1: Begin by understanding the anatomy of the human respiratory system. The respiratory system is responsible for gas exchange, and air travels through a series of structures before reaching the lungs.

Step 2: Identify the role of each structure listed in the problem: - Alveolus: These are tiny air sacs in the lungs where gas exchange occurs, but they do not deliver air directly to the lungs. - Larynx: Known as the voice box, it is involved in sound production and serves as a passageway for air but does not directly deliver air to the lungs. - Trachea: This is the windpipe that carries air from the throat to the bronchi but does not directly deliver air to each lung. - Primary bronchus: These are the two main branches of the trachea that directly deliver air to each lung.

Step 3: Focus on the primary bronchus. The trachea divides into the left and right primary bronchi, which are responsible for delivering air directly to the left and right lungs, respectively.

Step 4: Understand the hierarchical structure of the respiratory system: Air flows from the nasal cavity → pharynx → larynx → trachea → primary bronchi → lungs → bronchioles → alveoli.

Step 5: Conclude that the primary bronchus is the correct structure that delivers air directly to each lung, based on its anatomical function and position in the respiratory pathway.