Answer: Neither anti-A nor anti-B.
- A Anti-A only
- B Anti-B only
- C Both anti-A and anti-B
- D Neither anti-A nor anti-B
Correct answer: D. Neither anti-A nor anti-B
Explanation: Group AB individuals carry both A and B antigens on their red cells and therefore have no anti-A or anti-B antibodies in the plasma, making them universal recipients.
A single ECG cycle: the P wave marks atrial depolarisation (contraction signal), the large QRS complex marks ventricular depolarisation, and the T wave marks ventricular repolarisation (recovery) before the next cycle begins.
Concept context
Blood, lymph, the heart, the cardiac cycle, blood pressure, and ECG. High NEET weightage.