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 Heart2h 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

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Ventilation occurs when:

Muscles cause the volume of the thoracic cavity to change.

The gas molecules pass between air and the blood.

Changes in pressure cause a change in the size of the thoracic cavity.

The lungs contract and relax, altering the size of the thoracic cavity.

Previous problemNext problem

Verified step by step guidance

Understand that ventilation is the process of moving air in and out of the lungs, which is essential for gas exchange between the air and the blood.

Recognize that the primary muscles involved in ventilation are the diaphragm and the intercostal muscles. These muscles contract and relax to change the volume of the thoracic cavity.

When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity. This decrease in pressure inside the thoracic cavity allows air to flow into the lungs.

During exhalation, the diaphragm relaxes and moves upward, while the intercostal muscles relax, decreasing the volume of the thoracic cavity and increasing the pressure, which pushes air out of the lungs.

Understand that the changes in pressure within the thoracic cavity are crucial for the movement of air, and this is facilitated by the contraction and relaxation of the muscles, altering the size of the thoracic cavity.