Answer: AB positive.
- A AB positive
- B O negative
- C A positive
- D B negative
Correct answer: A. AB positive
Explanation: AB-positive blood has no antibodies against A, B or Rh, so it can receive any type.
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.