Textbook Question
Cary hyperventilates for several minutes before diving into a swimming pool. After he enters and begins swimming underwater, he blacks out and almost drowns. What caused this to happen?
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Ch. 23 The Respiratory System
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
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Table of contents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Not the one you use?Change textbook
Chapter 23, Problem 30
Doris has an obstruction of her right primary bronchus. As a result, how would the oxygen–hemoglobin saturation curve for her right lung compare with that for her left?
Verified step by step guidance1
Understand the oxygen–hemoglobin saturation curve: This curve represents the relationship between the partial pressure of oxygen (PO₂) and the percentage of hemoglobin saturated with oxygen. Factors like oxygen availability, carbon dioxide levels, pH, and temperature can shift the curve.
Recognize the impact of the obstruction: An obstruction in the right primary bronchus reduces airflow to the right lung, leading to decreased oxygen levels (hypoxia) in the alveoli of the right lung. This will affect the oxygen–hemoglobin saturation curve for the right lung.
Analyze the physiological response: In the right lung, reduced oxygen levels will lower the partial pressure of oxygen (PO₂). This causes hemoglobin to release oxygen more readily, shifting the oxygen–hemoglobin saturation curve to the right for the right lung. This shift indicates decreased oxygen saturation at a given PO₂.
Compare with the left lung: The left lung, which is unaffected, will maintain normal oxygen levels and a normal oxygen–hemoglobin saturation curve. The curve for the left lung will remain in its typical position, reflecting normal oxygen saturation at a given PO₂.
Summarize the comparison: The oxygen–hemoglobin saturation curve for the right lung will be shifted to the right due to lower oxygen levels, while the curve for the left lung will remain unchanged, reflecting normal oxygen saturation.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Oxygen-Hemoglobin Saturation Curve
The oxygen-hemoglobin saturation curve illustrates the relationship between the partial pressure of oxygen (pO2) and the percentage of hemoglobin saturated with oxygen. This curve is sigmoidal in shape, indicating that hemoglobin's affinity for oxygen increases as more oxygen molecules bind. Understanding this curve is crucial for analyzing how changes in oxygen availability affect oxygen transport in the lungs.
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Bronchial Obstruction
Bronchial obstruction refers to a blockage in the airways, which can significantly impair airflow and gas exchange in the affected lung. In Doris's case, the obstruction of the right primary bronchus would lead to reduced ventilation in the right lung, resulting in lower oxygen levels and potentially affecting the oxygen-hemoglobin saturation in that lung compared to the unobstructed left lung.
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Ventilation-Perfusion (V/Q) Ratio
The ventilation-perfusion (V/Q) ratio is a measure of the efficiency of gas exchange in the lungs, representing the relationship between air reaching the alveoli (ventilation) and blood flow in the pulmonary capillaries (perfusion). An obstruction in one bronchus can lead to a mismatch in this ratio, causing the affected lung to have lower oxygen saturation due to inadequate ventilation compared to the well-ventilated lung.
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Related Practice
Textbook Question
What are the differences between pulmonary volumes and respiratory capacities? How are pulmonary volumes and respiratory capacities determined?
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Textbook Question
Why do individuals who are anemic generally not exhibit an increase in respiratory rate or tidal volume, even though their blood is not carrying enough oxygen?
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