Where does the blood in the right atrium come from?
singleAnswer
coronary sinus venae cavae
Atrium (heart)
Where does the blood in the right atrium come from?
Atrium (heart) Coronary sinus Pulmonary circulation Ventricle (heart) Coronary circulation Fetal circulation Inferior vena cava Systole Venous blood Pulmonary vein
The atrium (Latin ātrium, “entry hall”) is the upper chamber through which <b>blood</b> 
enters the ventricles of the heart. There are two atria in the human heart – the <b>left</b> 
<b>atrium</b> receives <b>blood</b> from ... inside the atrium and the smooth-walled part of the 
<b>right atrium</b>, the sinus venarum, which are <b>derived from</b> the sinus venosus. It delivers less-oxygenated <b>blood</b> to the <b>right atrium</b>, as <b>do</b> the superior and 
inferior venae cavae. It is present in all mammals, including humans. The name 
<b>comes</b>&nbsp;... The pulmonary circulation is the portion of the circulatory system which carries 
deoxygenated <b>blood</b> away from the <b>right ventricle</b>, to the lungs, and returns&nbsp;... The <b>right ventricle</b> receives deoxygenated <b>blood</b> from the <b>right atrium</b> via the 
tricuspid valve and pumps it into the pulmonary artery via the&nbsp;... The left coronary artery distributes <b>blood</b> to the left side of the heart, the <b>left atrium</b> 
and ventricle, and the interventricular septum. The circumflex artery arises from&nbsp;... Some of the <b>blood</b> from the <b>right atrium does</b> not enter the <b>left atrium</b>, but enters 
the <b>right ventricle</b> and is pumped into the pulmonary artery. In the fetus, there is a
&nbsp;... The inferior vena cava (or IVC) is a large vein that carries the deoxygenated 
<b>blood</b> from the lower and middle body into the <b>right atrium</b> of the heart. Its walls 
are rigid and it has valves so the <b>blood does</b> not flow down via&nbsp;... The second stage proceeds immediately, pumping oxygenated <b>blood</b> from the 
<b>left ventricle</b> through the aortic valve and aorta to all body systems, and&nbsp;... Venous <b>blood</b> is deoxygenated <b>blood</b> which travels from the peripheral vessels, 
through the venous system into the <b>right atrium</b> of the heart. Deoxygenated <b>blood</b> 
is then pumped by the <b>right ventricle</b> to the lungs via the ... difference in shape of 
the red <b>blood</b> cell when hemoglobin binds to it (oxygenated) verses <b>does</b> not&nbsp;... The pulmonary veins are the veins that transfer oxygenated <b>blood</b> from the lungs 
to the heart. The largest pulmonary veins are the four main pulmonary veins, two 
from each lung that drain into the <b>left atrium</b> of the heart.
venous circulation
Atrium (heart)