Answer: red blood cells.
- A red blood cells
- B white blood cells
- C platelets
- D nerve cells
Correct answer: A. red blood cells
Explanation: Red blood cells (erythrocytes) transport oxygen via haemoglobin.
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.