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Questions and Answers
What is the primary function of myoglobin in vertebrates?
What is the primary function of myoglobin in vertebrates?
- To transport carbon dioxide
- To facilitate diffusion of glucose
- To transport nutrients to tissues
- To store and release oxygen (correct)
In deep-diving mammals, how does the concentration of myoglobin in muscles compare to that in terrestrial mammals?
In deep-diving mammals, how does the concentration of myoglobin in muscles compare to that in terrestrial mammals?
- It is 5-10 times higher
- It is 10-30 times higher (correct)
- It is approximately the same
- It is 2-5 times higher
According to Henry's Law, what relationship is observed regarding the solubility of a gas in a liquid?
According to Henry's Law, what relationship is observed regarding the solubility of a gas in a liquid?
- It is independent of the nature of the gas
- It is directly proportional to the pressure of the gas above the liquid (correct)
- It is inversely proportional to the temperature of the liquid
- It is directly proportional to the volume of the liquid
What is the approximate partial pressure of oxygen ($PO_2$) in tissues where myoglobin functions?
What is the approximate partial pressure of oxygen ($PO_2$) in tissues where myoglobin functions?
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Which of the following statements about myoglobin is incorrect?
Which of the following statements about myoglobin is incorrect?
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Study Notes
Myoglobin: Structure and Function
- Myoglobin is a protein found in muscle tissue of vertebrates and almost all mammals.
- Myoglobin facilitates the diffusion of oxygen into cells.
- Myoglobin has a higher concentration in deep-diving mammals compared to terrestrial mammals, acting as an oxygen storage molecule in this case.
- Myoglobin is an iron- and oxygen-binding protein.
- Myoglobin is present at a high concentration in muscle tissue (around 2 mg/g).
Oxygen Binding Curve for Myoglobin
- Myoglobin's oxygen binding follows Henry's Law: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.
- The oxygen binding curve for myoglobin is hyperbolic.
- Myoglobin has a high affinity for oxygen.
- Oxygen partial pressure (PO2) in tissues is around 30 torr.
- Oxygen partial pressure (PO2) in venous blood is around 40-50 torr.
- Oxygen partial pressure (PO2) in arterial blood is around 80-100 torr.
Myoglobin in Different Species
- The concentration of myoglobin varies across species.
- Flounder has very little myoglobin (around 0%).
- Chicken has some myoglobin.
- Beef has a significant amount of myoglobin.
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