Multiple Choice
Which protein is responsible for carrying oxygen in red blood cells (erythrocytes) in humans?
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8. Protein Function
Myoglobin vs. Hemoglobin
Multiple Choice
Which of the following best describes the primary role of myoglobin in vertebrate muscle tissue?
A
It catalyzes the breakdown of hydrogen peroxide.
B
It stores oxygen and facilitates its diffusion to muscle cells.
C
It acts as a buffer to maintain blood pH.
D
It transports oxygen from the lungs to peripheral tissues.
Verified step by step guidance1
Understand the role of myoglobin: Myoglobin is a globular protein found in muscle tissue, and its primary function is related to oxygen storage and transport within muscles.
Eliminate incorrect options: Myoglobin does not catalyze the breakdown of hydrogen peroxide. This is a function typically associated with enzymes like catalase.
Eliminate another incorrect option: Myoglobin does not act as a buffer to maintain blood pH. Buffers like bicarbonate are responsible for pH regulation in the blood.
Differentiate myoglobin from hemoglobin: Myoglobin is not responsible for transporting oxygen from the lungs to peripheral tissues. This is the role of hemoglobin in red blood cells.
Conclude the correct role: Myoglobin stores oxygen in muscle tissue and facilitates its diffusion to muscle cells, especially during periods of high metabolic demand, such as exercise.
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