Answer: 55%.
- A 55%
- B 25%
- C 75%
- D 10%
Correct answer: A. 55%
Explanation: Plasma forms roughly 55% of blood volume, cells the remaining 45%.
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.