Answer: arteries.
- A arteries
- B veins
- C capillaries
- D nerves
Correct answer: A. arteries
Explanation: Arteries carry blood away from the heart.
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.