Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Goblet cells secrete serous fluid into the respiratory tract.
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22. The Respiratory System
Introduction to Lung Physiology
Problem 14a
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.
Verified step by step guidance1
Understand the role of oxygen transport in the blood. Oxygen is carried from the lungs to the tissues primarily by binding to hemoglobin in red blood cells, not by dissolving in the plasma.
Recall that only a small percentage of oxygen (about 1.5%) is dissolved directly in the plasma due to its low solubility in water.
The majority of oxygen (about 98.5%) is transported by binding to hemoglobin, forming oxyhemoglobin (HbO₂).
Evaluate the statement: 'Oxygen is transported primarily by dissolving in the plasma.' This is false because the primary method of oxygen transport is via hemoglobin, not plasma.
Correct the statement: 'Oxygen is transported primarily by binding to hemoglobin in red blood cells, with only a small amount dissolved in the plasma.'
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Oxygen Transport in Blood
Oxygen transport in the blood occurs mainly through two mechanisms: binding to hemoglobin in red blood cells and dissolving in plasma. While a small amount of oxygen is carried dissolved in plasma, the majority (about 98.5%) is transported bound to hemoglobin, which allows for efficient oxygen delivery to tissues.
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Functions of Blood
Role of Hemoglobin
Hemoglobin is a protein found in red blood cells that binds to oxygen molecules. Each hemoglobin molecule can carry up to four oxygen molecules, significantly increasing the blood's oxygen-carrying capacity compared to what could be transported dissolved in plasma alone. This binding is crucial for maintaining adequate oxygen levels in the body.
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Plasma and Gas Solubility
Plasma is the liquid component of blood that carries various substances, including gases. While gases like oxygen can dissolve in plasma, their solubility is limited. This is why the majority of oxygen is transported via hemoglobin, as the amount that can be carried dissolved in plasma is insufficient for the body's needs.
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