Blood types are determined by the presence or absence of certain antigens – substances that can trigger an immune response if they are foreign to the body. Since some antigens can trigger a patient's immune system to attack the transfused blood, safe blood transfusions depend on careful blood typing and cross-matching. Normocytic: Hematology A condition characterized by ↓ RBCs or Hb in the blood, resulting in ↓ O 2 in peripheral tissues Clinical Fatigability, pallor, palpitations, SOB; anemias are divided into various groups based on cause–eg, iron deficiency anemia, megaloblastic anemia–due to ↓ vitamin B 12 or folic acid, or aplastic anemia–where RBC ... Bengali (/ b ɛ ŋ ˈ ɡ ɔː l i /), also known by its endonym Bangla (বাংলা), is an Indo-Aryan language primarily spoken by the Bengalis in South Asia.It is the official and most widely spoken language of Bangladesh and second most widely spoken of the 22 scheduled languages of India, behind Hindi. Nov 01, 2012 · Blood group definition is - one of the classes (such as those designated A, B, AB, or O) into which individuals or their blood can be separated on the basis of the presence or absence of specific antigens in the blood —called also blood type. The ABO group system gives the letter part of your blood type and Rhesus system gives the positive or negative part. The ABO group system. There are four main blood groups in the ABO group system. Each group is important and we need donors from every group to ensure we have the right blood for the people who need it.