Answer: White blood cells.
- A Red blood cells
- B Platelets
- C White blood cells
- D Plasma
Correct answer: C. White blood cells
Explanation: White blood cells (WBCs/leukocytes) are part of the immune system. They fight infections and foreign particles.
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.