Answer: antigen.
- A antigen
- B enzyme
- C hormone
- D vitamin
Correct answer: A. antigen
Explanation: The Rh factor is an antigen; people with it are Rh-positive.
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.