Describe the structure and working of the human heart .

Explanation

The human heart is four chambered. The two upper thin walled chambers, Auricle or Atria and the lower thick walled chambers ventricles. The chambers are separated by septum. The two auricles are separated by inter atrial septum and the two ventricles are separated by inter ventricular septum.
The right atrium receives deoxygenated blood from different parts of the body through superior vena cava, inferior vena cava and coronary sinus. Pulmonary veins bring oxygenated blood from the lungs to the left atrium. Both the right and the left auricles pump blood into the right and left ventricles respectively.
From the right ventricle, the pulmonary arteries supply deoxygenated blood to the lungs. From the left ventricle, the Aorta carries the Oxygenated blood to the various organs of the body. The coronary arteries supply blood to the heart. This process is repeated again and again.