Answer: defence against disease.
- A defence against disease
- B the carrying of oxygen
- C the clotting of blood
- D the digestion of food
Correct answer: A. defence against disease
Explanation: White blood cells (leucocytes) defend the body against infection.
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.