Biology for IGCSE & O level - Transport In Animals (Section 7 - No. 27)
What is the correct sequence of blood flow through the heart?
Right atrium -> Right ventricle -> Lungs -> Left atrium -> Left ventricle
Left atrium -> Left ventricle -> Lungs -> Right atrium -> Right ventricle
Right atrium -> Left atrium -> Lungs -> Right ventricle -> Left ventricle
Left ventricle -> Left atrium -> Lungs -> Right ventricle -> Right atrium
Explanation
Deoxygenated blood enters the right atrium, moves to the right ventricle, then the lungs, and returns to the left atrium, finally going to the left ventricle.
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