- 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.
Concept context
Blood, lymph, the heart, the cardiac cycle, blood pressure, and ECG. High NEET weightage.