Chambers Of Heart
Heart has 4 chambers- two Atria (atrium-singular) and two Ventricles.
The atria have thinner walls compared to those of ventricles which are thick and muscular.
The atria receive blood and ventricles pump blood.
The wall that separates left and right atria is known as Inter Atrial Septum (IAS) and the one that separate ventricles is called Inter Ventricular Septum (IVS).