Question

There is no mixing of oxygenated blood and deoxygenated blood in atria give reasons for it.

Answer 1

Auricles:

1. They are the upper chambers of the heart.
2. They are separated by the inter atrial septum.
3. There is no mixing of deoxygenated and oxygenated blood in human heart due to the presence of inter-atrial and inter-ventricular septum.
4. These septa completely divide the atria and ventricles into right and left to avoid mixing of blood.