Final answer:
Reduced hemoglobin is also known as deoxyhemoglobin. It is responsible for transporting carbon dioxide from the body tissues back to the lungs.
Step-by-step explanation:
The term for reduced hemoglobin is deoxyhemoglobin. When oxygen is not bound to hemoglobin, it is in the deoxygenated state, resulting in a darker red color. Deoxyhemoglobin is responsible for transporting carbon dioxide from the body tissues back to the lungs.