Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The tidal volume is the amount of air left in the lungs after maximal expiration.
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Ch. 21 The Respiratory System
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology26
- Ch. 2 The Chemistry of Life38
- Ch. 3 The Cell55
- Ch. 4 Histology47
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System36
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System42
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart30
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity45
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Chapter 21, Problem 11
Which of the following does not affect the efficiency of pulmonary gas exchange?
a. The surface area of the respiratory membrane
b. The degree of match of ventilation to perfusion
c. The percent saturation of hemoglobin
d. The thickness of the respiratory membrane
Verified step by step guidance1
Step 1: Understand the concept of pulmonary gas exchange. Pulmonary gas exchange refers to the process by which oxygen is transferred from the alveoli in the lungs to the blood, and carbon dioxide is transferred from the blood to the alveoli. This process is influenced by several factors, including the surface area of the respiratory membrane, the thickness of the respiratory membrane, and the matching of ventilation (airflow) to perfusion (blood flow).
Step 2: Analyze the role of the surface area of the respiratory membrane. A larger surface area allows for more efficient gas exchange because it provides more space for oxygen and carbon dioxide to diffuse across the membrane. A reduction in surface area, such as in conditions like emphysema, can impair gas exchange.
Step 3: Examine the importance of the thickness of the respiratory membrane. The respiratory membrane must be thin to allow for efficient diffusion of gases. If the membrane becomes thicker, as in pulmonary edema, the diffusion of gases is slowed, reducing the efficiency of gas exchange.
Step 4: Consider the degree of match between ventilation and perfusion. Ventilation-perfusion matching ensures that areas of the lung receiving airflow also receive adequate blood flow for gas exchange. Mismatches, such as in conditions like pulmonary embolism, can reduce the efficiency of gas exchange.
Step 5: Evaluate the percent saturation of hemoglobin. While hemoglobin saturation is critical for oxygen transport in the blood, it does not directly affect the efficiency of gas exchange at the respiratory membrane. Instead, it reflects how much oxygen is bound to hemoglobin after gas exchange has occurred.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Pulmonary Gas Exchange
Pulmonary gas exchange refers to the process by which oxygen is transferred from the alveoli in the lungs to the blood, and carbon dioxide is removed from the blood to be exhaled. This process is crucial for maintaining adequate oxygen levels in the body and removing metabolic waste. Factors influencing this exchange include surface area, ventilation-perfusion matching, and membrane thickness.
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Ventilation-Perfusion Matching
Ventilation-perfusion matching is the relationship between the air reaching the alveoli (ventilation) and the blood flow in the surrounding capillaries (perfusion). An optimal match is essential for efficient gas exchange; if ventilation exceeds perfusion or vice versa, it can lead to reduced oxygen uptake and carbon dioxide removal, impacting overall respiratory efficiency.
Respiratory Membrane Characteristics
The respiratory membrane is the barrier through which gas exchange occurs, consisting of the alveolar epithelium, the capillary endothelium, and their fused basement membranes. Key characteristics include its surface area and thickness; a larger surface area and thinner membrane enhance gas exchange efficiency, while increased thickness can impede the process, leading to respiratory issues.
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Related Practice
Textbook Question
When the alveolar Pco₂ decreases, the pulmonary arterioles_____. When the arteriolar Pco₂ increases, the bronchioles_______.
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Textbook Question
Henry's law states that the degree to which a gas dissolves in a liquid is determined by its:
a. Partial pressure
b. Solubility
c. Surface tension
d. Both a and b are correct
e. All of the above are correct
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The vital capacity is the total amount of exchangeable air.
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The inspiratory capacity is equal to the vital capacity plus the tidal volume.
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Oxygen is transported primarily by dissolving in the plasma.
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