The heme portion of hemoglobin contains iron that binds reversibly with oxygen. In addition to oxygen and carbon dioxide transport, hemoglobin functions in blood pressure regulation by ferrying nitric oxide throughout the body.
A) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second is false.
D) The second statement is true; the first is false.

Question

Quizplus · Accepted Answer

Both statements are true. The heme portion of hemoglobin indeed contains iron that is essential for oxygen binding, allowing hemoglobin to transport oxygen throughout the body. Additionally, hemoglobin does play a role in blood pressure regulation by transporting nitric oxide, a vasodilator that helps in regulating blood vessel dilation and thus blood pressure.

The Heme Portion of Hemoglobin Contains Iron That Binds Reversibly