Blood enters the heart from the systemic circulation in the right atrium, and then moves to the right ventricle. From there, blood is pumped into the pulmonary circulation. When the blood returns from the lungs, it enters the left atrium, then left ventricle, then is pumped to body tissues via the systemic circulation.
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.
Right atrium
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.
Blood enters the heart through the Inferior Vena Cava from all the regions of the body below the heart
Deoxygenated blood enters the heart via the superior and inferior vena cava.
The adrenal glands secrete adrenaline which enters the blood stream, and is carried by the blood to the heart.
it becomes oxygenated