Page 3 - LN

 The heart is divided into four chambers — two upper atria and two lower ventricles.
 To avoid mixing of oxygenated and deoxygenated blood, heart has four chambers.
 The four chambers of heart are right atrium (auricle), left atrium (auricle), right
ventricle and left ventricle.
 The partition between the chambers are called septum which help to avoid the
mixing of blood.
 The inter-atrial septum separates the two atria and the inter-ventricular septum

separates the two ventricles.
 The atrium and the ventricle of each side are separated by the atrio-ventricular
septum.

 Superior and inferior vena cava open into the right atrium.