18. How does the blood from the lungs travel back into the heart?
A. lungs pulmonary veins left atrium → left ventricle
B. lungs→ pulmonary arteries → left atrium → left ventricle
C. lungs→ pulmonary arteries → left ventricle → left atrium
D. lungs→ pulmonary left ventricle → left atrium
A. lungs pulmonary veins left atrium → left ventricle
B. lungs→ pulmonary arteries → left atrium → left ventricle
C. lungs→ pulmonary arteries → left ventricle → left atrium
D. lungs→ pulmonary left ventricle → left atrium
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Answer:
A.
Explanation:
Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.