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Sinus venosus is formed by the union of 2 post caval veins and 1 precaval vein. The sinus venosus receives deoxygenated blood and passes it into auricle in case of fishes and into right auricle in case of amphibians and reptiles.

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What is the function of the sinus venosus?

it receives the deoxygenated blood and passes it to auricles in fishes and to right auricle in amphibians and reptiles


In mammals and birds there's no sinus venosus instead they have the?

In mammals and birds, the sinus venosus has evolved into the right atrium of the heart. This structure serves to collect and regulate blood flow entering the heart before it is pumped to the rest of the body.


How does the sinus venosus function in a frog?

sinus Venuses recives De-oxygenated blood fromtwo superior vsna cavae and one inferior vena cava and then pass this blood to right artrium


What is sinoatrial valve?

Also spelled sinuatrial valve. It is the valve at the opening of the embryonic sinus venosus into the primordial right atrium. The sinus venosus later develops into part of the right atrium wall, the SA node and the coronary sinus.


What are the extensions of the atria?

The right atrium receives blood from the superior and inferior vena cava, as well as the coronary sinus. The left atrium receives blood from the pulmonary veins.


What is the general path of blood flow in a fish?

In fish, blood first enters the heart through the sinus venosus, then flows into the atrium, followed by the ventricle where it gets pumped to the gills for oxygenation. The oxygenated blood then travels to the body tissues before returning to the heart to start the cycle again.


Where do the lungs receive blood from?

It receives blood from the pulmonary trunk coming out of the right ventricle of the heart.


What is the most fetal blood in the umbilical vein enters the inferior vena cava through?

The most fetal blood in the umbilical vein enters the inferior vena cava through the ductus venosus.


What structure serves as the lungs for a fetus?

The structure that allows blood to bypass a fetus inmmature liver is called ductus venosus.


The shunt that allows most fetal blood to bypass the liver?

The Ductus Venosus


Why is the ductus venosus no longer needed when the pig born?

The ductus venosus is a fetal blood vessel that allows oxygenated blood from the placenta to bypass the liver and flow directly into the inferior vena cava, facilitating efficient circulation. Once a pig is born, it begins to breathe air, and its lungs expand, significantly increasing blood flow to them. This shift in circulation makes the ductus venosus unnecessary, as oxygenated blood can now be obtained directly from the lungs rather than the placenta. Consequently, the ductus venosus closes and eventually becomes a fibrous remnant in the adult pig.


Where does the right atrium take the blood to?

The right atrium pumps the blood it receives from the body (through the superior and inferior vena cavae and the coronary sinus) to the right ventricle which then sends it to the lungs.