Answer: clotting of blood.
- A clotting of blood
- B carrying oxygen
- C fighting infection
- D digesting food
Correct answer: A. clotting of blood
Explanation: Platelets help blood to clot at the site of injury.
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.