Domanda del libro di testo
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Hb in arterial blood is normally almost fully saturated.
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Ch. 21 The Respiratory System
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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TOC.tableOfContents
- 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
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Non è quello che usi tu?Cambia libro di testo
Capitolo 21, Problema 14d
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
When the PO₂ of arterial blood drops slightly, the percent saturation of Hb drops dramatically.
Guida verificata passo dopo passo1
Understand the relationship between partial pressure of oxygen (Po₂) and hemoglobin (Hb) saturation. This is described by the oxygen-hemoglobin dissociation curve, which is sigmoidal in shape.
Recall that at high Po₂ levels (such as in arterial blood), hemoglobin is nearly fully saturated with oxygen. Small decreases in Po₂ in this range result in minimal changes in Hb saturation.
Recognize that dramatic drops in Hb saturation occur in the steep portion of the dissociation curve, which corresponds to lower Po₂ levels (such as in tissues).
Evaluate the statement: 'When the Po₂ of arterial blood drops slightly, the percent saturation of Hb drops dramatically.' Based on the dissociation curve, this is false because arterial blood Po₂ is in the flat portion of the curve, where Hb saturation remains relatively stable.
Correct the statement: 'When the Po₂ of arterial blood drops slightly, the percent saturation of Hb remains relatively stable due to the flat portion of the oxygen-hemoglobin dissociation curve.'
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Oxygen Saturation and Partial Pressure
Oxygen saturation refers to the percentage of hemoglobin molecules in the blood that are bound to oxygen. The partial pressure of oxygen (Po₂) is a measure of the amount of oxygen dissolved in the blood. A drop in Po₂ can lead to a decrease in oxygen saturation, but the relationship is not always dramatic, especially within certain physiological ranges.
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6:12
Partial Pressure
Hemoglobin-Oxygen Dissociation Curve
The hemoglobin-oxygen dissociation curve illustrates how hemoglobin's affinity for oxygen changes with varying levels of Po₂. This curve is sigmoidal, indicating that small changes in Po₂ at higher levels can lead to relatively small changes in saturation, while larger changes occur at lower levels. Understanding this curve is crucial for interpreting how oxygen transport is affected by changes in Po₂.
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Percorso guidato
7:52Function of Hemoglobin
Physiological Response to Hypoxia
Hypoxia refers to a deficiency in the amount of oxygen reaching the tissues. The body has various physiological responses to hypoxia, including increased heart rate and respiratory rate, as well as adjustments in hemoglobin affinity for oxygen. Recognizing these responses helps in understanding how the body compensates for changes in oxygen availability and the implications for oxygen saturation.
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Percorso guidato
9:59Steps of the Interferon Response
Pratica correlata
Domanda del libro di testo
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Increased PCO2, temperature, and hydrogen ion concentration all increase Hb's affinity for oxygen.
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Domanda del libro di testo
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Each Hb protein can carry up to four oxygen molecules.
116
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Domanda del libro di testo
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.
112
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