Adecrease in the oxygen-carrying ability of the blood, for any reason, is a condition known as

ANEMIA

Anemia is a condition of the blood where there is not enough red blood cells or hemoglobin. Hemoglobin has an iron core and is the main part of the red blood cells where oxygen from the lungs binds. IF hemoglobin is too low or abnormal delivery of oxygen to the body will be altered. There are various reasons for anemia to happen. This cane be due to abnormal cell development, deficiency in iron, malabsorption of vitamins. Symptoms includes pale skin, fatigue, palpitations, shortness of breath.