Table of contents

Skip topic navigation

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

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

Which statement describes the movement of oxygen during external respiration?

Oxygen is actively transported from the blood into the alveoli.

Oxygen is actively transported from the alveoli into the blood.

Oxygen diffuses from the blood into the alveoli.

Oxygen diffuses from the alveoli into the blood.

Previous problemNext problem

Verified step by step guidance

Understand the concept of external respiration: External respiration is the process of gas exchange between the air in the alveoli and the blood in the pulmonary capillaries.

Identify the role of oxygen in external respiration: Oxygen needs to move from the alveoli, where its concentration is higher, to the blood, where its concentration is lower.

Recognize the mechanism of oxygen movement: Oxygen moves by diffusion, which is a passive process where molecules move from an area of higher concentration to an area of lower concentration.

Apply the concept of diffusion to the scenario: In external respiration, oxygen diffuses from the alveoli (high concentration) into the blood (low concentration).

Conclude with the correct statement: The correct description of oxygen movement during external respiration is that oxygen diffuses from the alveoli into the blood.