Zoology-Heart & Circulation
NEET Zoology Heart & Circulation MCQ Question
Type: MCQ-diagram based-Medium-Class 11
Imagine a diagram depicting the cardiac cycle, focusing on the initial phase where all four heart chambers are relaxed. Which of the following accurately describes the state of the heart at this stage?
A
The tricuspid and bicuspid valves are open, allowing blood flow into the ventricles.
B
The semilunar valves are open, allowing blood to exit the heart.
C
The atria are contracting, pushing blood into the ventricles.
D
The ventricles are contracting, forcing blood into arteries.
Correct Answer
Option A
Detailed Explanation
During the initial phase of the cardiac cycle, known as joint diastole, the heart chambers are relaxed, the tricuspid and bicuspid valves are open, and blood flows into the ventricles. This is before atrial systole is triggered by the SAN.
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