Answer: Iron.
- A Magnesium
- B Zinc
- C Iron
- D Copper
Correct answer: C. Iron
Explanation: Haemoglobin contains iron (Fe) in its heme group. Iron binds to oxygen. Iron deficiency causes anaemia.
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.