Doctors use stethoscopes to hear the sound produced during each cardiac cycle. The second sound is heard when
A. AV nodes receives signal from SA node
B. All valves open up
C. Ventricular walls vibrate due to gushing in of blood from atria
D. Semilunar valves close down after blood flows into vessels from ventricles
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Person with blood group AB is considered as universal recipient because he has
A. Both A & B antigens on RBC but no antibodies in the plasma
B. Both A & B antibodies in the plasma
C. No antigen on RBC & no antibody in the plasma
D. Both A & B antigens in the plasma but no antibodies
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