Blood functions to: 1 protect against its excessive loss after injury
2 play a role in pH regulation
3 protect against UV radiation damage
4 protect against disease
5 assist with regulation of body temperature
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.
Which disorder is characterized by slightly bluish/dark-purple skin discoloration, most easily seen in the nail beds and mucous membranes, due to an increased quantity of methemoglobin, hemoglobin not combined with oxygen in systemic blood.