Atrial systole lasts for about

0.1 second

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0.8 second

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0.4 second

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0.3 second

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Solution

The correct option is A 0.1 second
A cardiac cycle consists of three phases (joint diastole, atrial systole and ventricular systole) and lasts for 0.8 second. During atrial systole or contraction, the right atrium pours deoxygenated blood into the right ventricle while the left atrium pours oxygenated blood into the left ventricle. This lasts for 0.1 second.

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The steps of the cardiac cycle in sequence after atrial systole _______.

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