Answer: backflow.
- A backflow
- B forward flow
- C clotting
- D oxygenation
Correct answer: A. backflow
Explanation: Heart valves ensure blood flows in one direction only, preventing backflow.
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.