Multiple Choice
Approximately how many erythrocytes (red blood cells) are present in a typical drop of blood?
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17. The Blood
Erythrocytes
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What is the primary function of the protein spectrin in erythrocytes?
A
To allow efficient gas exchange of oxygen and carbon dioxide into and out of erythrocytes.
B
To maintain the shape of erythrocytes and allow them to change shape when needed.
C
To make ATP, as there are no mitochondria in erythrocytes.
D
To hold hemoglobin molecules in place.
Verified step by step guidance1
Understand the role of spectrin: Spectrin is a cytoskeletal protein that is crucial for maintaining the structural integrity of cells, particularly erythrocytes (red blood cells).
Recognize the importance of erythrocyte shape: Erythrocytes need to maintain a biconcave shape to maximize surface area for gas exchange and to be flexible enough to navigate through narrow capillaries.
Identify spectrin's function: Spectrin forms a mesh-like network beneath the plasma membrane of erythrocytes, providing mechanical support and flexibility.
Differentiate from other functions: While spectrin is essential for maintaining cell shape, it does not directly participate in gas exchange, ATP production, or holding hemoglobin in place.
Conclude the primary function: The primary function of spectrin in erythrocytes is to maintain their shape and allow them to change shape when needed, ensuring they can function effectively in the circulatory system.
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