Right atrium
arteries
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The heart is divided into four compartments. The two upper portions where blood enters the heart from the body and lungs are the atria. Deoxygenated blood enters the right atrium, and oxygenated blood from the lungs enter the left atrium.
Venous blood enters the ventricle. The lung oxygenates blood from the aorta.
The entire heart pumps blood. The blood enters the heart via the superior vena cava, is pumped through the heart's right atrium to the right ventricle. Afterwards, it leaves the heart and enters the lungs. The blood is then sent back to the heart where it enters the hearts left atrium. It is pumped to the left ventricle and finally out of the heart to circulate throughout the body.
When blood leaves the lungs through the pulmonary veins, it returns to the heart and enters the left ventricle.
Oxygen-poor blood enters the heart through the right atrium
Oxygenated blood enters the left side of the heart (atria) via the pulmonary veins
De-oxygenated blood is dark red. Oxygenated blood is bright red. Both enter the heart- the former enters the right heart; the latter enters the left heart.
Blood returning from the body systemic circulation first enters which chamber of the heart?
The blood enters throught the heart throught the right and left atria. As the heart contracts, blood flows into the ventricles and then out from the ventricles.
Blood returning from systemic circulation enters the heart at the right atrium. Blood from the pulmonary circulation enters the left atrium.