What enters heart though right atrium?

Answer 1

The right ventricle receives blood from the right atrium, and the right atrium receives blood from the pulmonary veins.This blood was already drained from the whole body to the vena cavae. So its from veins in the body to venae cavae, from venae cavae to pulmonary veins, from pulmonary veins to the right atrium, from the right atrium then to the right ventricle.

Answer 2

Superior vena cava AND inferior vena cava, however the deoxygenated blood then flows through the tricuspid valve into the right ventricle. It leaves the heart through the pulmonary valve into the left and right pulmonary arteries to the lungs for oxygen (O2) from the alveoli.

Oxygenated blood then returns to the heart through the left and right pulmonary veins into the left atrium through the mitral (bicuspid) valve, into the left ventricle.

It continues through the aortic valve, into the aorta, where oxygenated blood is distributed throughout the body to the arteries, capillaries, veins and the vena cavae.

Then the cycle begins again...and again...and again...

Answer 3

Blood from the superior and inferior vena cavae.

coronary sinus.

Answer 4

Deoxygenated blood

Answer 5

inferior and superior vena cava