Blood entering the heart from the vena cava passes through, or past, several structures before entering the lungs.
Five of these structures are included in this list.
- atrioventricular node
- aorta
- semilunar valve
- left atrium
- pulmonary vein
- Purkyne tissue
- sinoatrial node
- pulmonary artery
After arranging these five structures in the correct order of blood flow from the vena cava to the lungs, which structure will be third?
1 )
atrioventricular node
Purkyne tissue
3 )
semilunar valve
4 )
sinoatrial node
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