Place these structures in the order that blood returning to the heart from the body would pass through them.
1. right ventricle
2. left atrium
3. right atrium
4. pulmonary artery
5. left ventricle
6. pulmonary vein
A) 4, 2, 5, 6, 3, 1
B) 1, 3, 6, 4, 5, 2
C) 2, 5, 6, 4, 3, 1
D) 3, 2, 4, 6, 1, 5
E) 3, 1, 4, 6, 2, 5
E) 3, 1, 4, 6, 2, 5
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What does "B" represent on the diagram?
A. Cross-bridge B. Actin myofilament C. Myosin myofilament D. Sarcomere E. Z disk