Answer: Joint diastole, when both chambers rest together.
- A Joint diastole, when both chambers rest together
- B Isovolumetric contraction, a brief tension phase
- C Atrial systole, when atria are contracting
- D Ventricular systole, when ventricles are contracting
Correct answer: A. Joint diastole, when both chambers rest together
Explanation: During joint diastole, both the atria and ventricles are relaxed simultaneously, allowing blood to passively fill the atria before the next cycle begins.
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.