Explanation:

• Anemia happens when the number of healthy red blood cells in your body is too low. Red blood cells carry oxygen to all of the body’s tissues, so a low red blood cell count indicates that the amount of oxygen in your blood is lower than it should be.
• Many of the symptoms of anemia are caused by decreased oxygen delivery to the body’s vital tissues and organs.
• Anemia is measured according to the amount of hemoglobin — the protein within red blood cells that carries oxygen from the lungs to the body’s tissues.