Answer: O negative.
- A O negative
- B AB positive
- C A positive
- D B negative
Correct answer: A. O negative
Explanation: O-negative blood lacks A, B and Rh antigens, so it can be given to anyone.
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.