Final answer:
Hemoglobin is crucial for transporting oxygen and carbon dioxide but does not have a direct role in regulating blood pressure.
Step-by-step explanation:
The function of hemoglobin in the blood is twofold: it is essential for the transport of oxygen from the lungs to the body's tissues and also plays a role in the transport of carbon dioxide from the tissues back to the lungs. The main form of hemoglobin, oxyhemoglobin (HbO₂), binds oxygen with high affinity under the high partial pressure of oxygen in the lungs. This oxygenated blood is then transported to various tissues where the oxygen is released.
For carbon dioxide transport, only a minor part is carried directly by hemoglobin as carbaminohemoglobin. The majority of carbon dioxide is transported as bicarbonate ions, which is facilitated by the enzyme carbonic anhydrase within red blood cells. This enzyme catalyzes the conversion of carbon dioxide and water into carbonic acid, which then spontaneously dissociates into bicarbonate and hydrogen ions, a reaction that is reversible in the lungs allowing carbon dioxide to be expelled.
In regulating blood pressure, hemoglobin does not have a direct function; instead, blood pressure regulation is achieved through complex mechanisms involving the heart, blood vessels, kidney, and nervous system among others.
Therefore, the statement that 'Hemoglobin functions in transporting both oxygen and carbon dioxide in regulating blood pressure' is partly false, as hemoglobin does not play a direct role in regulating blood pressure.