Question

Which of the following is an incorrect statement?
A. Blood group ‘O’ person has A and B antibodies in plasma.
B. Eosinophilia is associated with allergic reaction
C. RBCs contain carbonic anhydrase
D. T wave of normal ECG represent of depolarization of ventricle

Answer 1

Blood group is a classification of blood based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells. The two most important blood group systems are ABO and Rh.

Complete Answer:
- ABO blood group system has two antigens and two antibodies found in human blood. The antibodies are present in the serum and antigens are present on the RBCs. The most important blood group system in human blood transfusion is ABO.
- Blood group A has A antigens on the red blood cells. Blood group B has B antigens. Blood group O has no antigens but both anti-A and anti-B antibodies in plasma.
- Eosinophilia is a condition in which eosinophil count in the peripheral blood exceeds. In ECG, the T wave represents the repolarization of ventricles.
- In the RBCs, carbonic anhydrase helps in the conversion of carbon dioxide to carbonic acid and bicarbonate ions.
- Allergic reactions and parasitic disease are the common causes of eosinophilia.

So, the correct answer is D because the T wave of ECG does not represent depolarization of the ventricle.

Note: Electrocardiography is the process of producing an ECG. Carbonic anhydrase is an enzyme which catalyzes the interconversion between carbon dioxide and water and dissociated ions of carbonic acid. The Rh system is the second most significant blood group system in human blood transfusion. Blood group AB has both A and B antigens on the surface of RBCs.