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

22. The Respiratory System

Introduction to Lung Physiology

Anatomy & Physiology

22. The Respiratory System

Introduction to Lung Physiology

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Multiple Choice

What is the correct path a molecule of O2 takes from the nose to the respiratory surface in the lungs?

Nose → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli

Nose → Trachea → Larynx → Pharynx → Bronchi → Bronchioles → Alveoli

Nose → Larynx → Pharynx → Trachea → Bronchioles → Bronchi → Alveoli

Nose → Bronchi → Trachea → Larynx → Pharynx → Bronchioles → Alveoli

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Verified step by step guidance

Begin by understanding the anatomy of the respiratory system and the sequence of structures that air passes through from the external environment to the lungs.

The first step in the pathway is the nose, where air enters the respiratory system. The nose filters, warms, and humidifies the air.

Next, the air moves to the pharynx, a muscular tube that serves as a pathway for both air and food.

From the pharynx, the air travels to the larynx, which is also known as the voice box. The larynx is responsible for sound production and also protects the trachea against food aspiration.

After the larynx, the air enters the trachea, a tube that connects the larynx to the bronchi. The trachea splits into two bronchi, each leading to one lung, and the pathway continues through the bronchi, bronchioles, and finally reaches the alveoli, where gas exchange occurs.