In this video on Frog, Venous system is discussed.

Blood flow
- Deoxygenated blood from the tissues → Collected by major veins known as Vena cava
→ Poured in sinus venosus (triangular structure) → Open in the right atrium.
- Oxygenated blood from lungs → Collected by pulmonary veins → Poured in the left atrium.
- Both atria pour blood in ventricle → Oxygenated and deoxygenated blood mix in
ventricle → Mixed blood enters common artery Truncus arteriosus located on the
ventral side of the heart → Truncus arteriosus divides into systemic (to supply the body
tissues) and pulmonary branches (to supply the lungs).

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