
During ventricular systole

Important Questions on Body Fluids and Circulation









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The cardiac cycle refers to the repeating pattern of contraction and relaxation of the heart and it consists of three phases.
\n\nDiastole is the relaxation of the heart. Joint diastole is when both atria and ventricles relax simultaneously, and the phase lasts for 0.4 seconds of the entire cardiac cycle. During this phase of the cardiac cycle, the atrioventricular valves are open and the blood received by the atria enter into the ventricles, filling them approximately 70% of their total capacity.
\n\nThe end of joint diastole means the end of 1 heartbeat. The heart will now enter into the next cycle of heartbeat or cardiac cycle. So at the end of the joint diastole to begin a new heartbeat, the SA node generates an impulse, caused by its depolarization, which is evidenced by the appearance of the P wave on the ECG.
\n\n"},"encodingFormat":"text/html","position":3,"text":""},"comment":{"@type":"Comment","text":"'A' represent the relaxed state of heart."},"eduQuestionType":"Multiple choice","encodingFormat":"text/markdown","learningResourceType":"Practice problem","suggestedAnswer":[{"@type":"Answer","comment":{"@type":"Comment","text":"It is a wrong option."},"encodingFormat":"text/html","position":0,"text":""},{"@type":"Answer","comment":{"@type":"Comment","text":"It is a wrong option."},"encodingFormat":"text/html","position":1,"text":""},{"@type":"Answer","comment":{"@type":"Comment","text":"It is a wrong option."},"encodingFormat":"text/html","position":2,"text":""}],"text":"In the given figure the durations of the events of the cardiac cycle are given. Identify these events and select the correct option.