Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The main function of erythrocytes is to transport oxygen on the protein hemoglobin.
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17. The Blood
Introduction To Blood
Problem 6
Textbook Question
Erythrocytes are derived from stem cells called____, circulate in the blood for approximately _______ days, and are destroyed by an organ called the _______.
Verified step by step guidance1
Step 1: Understand that erythrocytes (red blood cells) are derived from stem cells in the bone marrow. These stem cells are specifically called hematopoietic stem cells (HSCs).
Step 2: Recall that erythrocytes have a lifespan of approximately 120 days in the bloodstream before they are removed from circulation.
Step 3: Identify the organ responsible for destroying old or damaged erythrocytes. This organ is the spleen, which acts as a 'red blood cell graveyard' and filters out aged cells.
Step 4: Connect the concepts: hematopoietic stem cells give rise to erythrocytes, which circulate for about 120 days, and are then destroyed by the spleen.
Step 5: Review the process of erythrocyte destruction in the spleen, where macrophages break down hemoglobin into its components, such as iron and bilirubin, for recycling or excretion.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Hematopoietic Stem Cells
Hematopoietic stem cells are multipotent stem cells located primarily in the bone marrow. They are responsible for the production of all blood cells, including erythrocytes (red blood cells). These stem cells undergo a process of differentiation and maturation to give rise to various blood cell lineages.
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Erythrocyte Lifespan
Erythrocytes typically have a lifespan of about 120 days in the human body. During this time, they circulate through the bloodstream, transporting oxygen from the lungs to tissues and returning carbon dioxide for exhalation. After their lifespan, they are removed from circulation and broken down.
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Spleen Function
The spleen is an organ that plays a crucial role in filtering blood and recycling components of erythrocytes. It is responsible for the destruction of old or damaged red blood cells, breaking them down into their constituent parts, which can be reused or excreted. This process is vital for maintaining healthy blood composition.
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