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

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

During which phase of pulmonary ventilation is air pushed out of the lungs?

Exhalation

Gas exchange

Inhalation

Oxygenation

Previous problemNext problem

Verified step by step guidance

Understand the concept of pulmonary ventilation, which refers to the process of moving air into and out of the lungs. It consists of two main phases: inhalation and exhalation.

Recall that during inhalation, the diaphragm contracts and moves downward, while the intercostal muscles expand the rib cage. This increases the thoracic cavity volume, reducing pressure inside the lungs and allowing air to flow in.

During exhalation, the diaphragm relaxes and moves upward, and the intercostal muscles allow the rib cage to return to its resting position. This decreases the thoracic cavity volume, increasing pressure inside the lungs and pushing air out.

Gas exchange refers to the process of oxygen and carbon dioxide moving between the alveoli and the blood, which occurs during both inhalation and exhalation but is not directly related to the physical movement of air out of the lungs.

Oxygenation is the process of oxygen binding to hemoglobin in the blood, which occurs after gas exchange in the lungs. It is not a phase of pulmonary ventilation.