Draw the internal structure of Heart and explain it briefly

Draw the internal structure of Heart and explain it briefly.

Internal Structure or the Anatomy of Heart:
The heart is a cone shaped hollow muscular organ. It lies in the thoracic cavity, just behind the breastbone (sternum) in between the lungs. It tips slightly towards the left hand side of the body.
The human heart weighs less than a pound (about 300 grams) and is roughly the size of an adult fist.
Structure of Heart:
The heart is a muscular cone-shaped organ about the size of a clenched fist of the same person. It is located in the upper body (chest area) between the lungs, and with its pointed end (called the apex) downwards, forwards, and pointing towards the left. The heart is a pump consisting of four chambers. It is vertically divided into two halves (left and right) by a septum. Each half is further divided into upper and lower halves, which communicates through atrio-ventricular valves. The two upper chambers are called atria (singular-atrium) and the two lower chambers are called ventricles.
The main purpose of the heart is to pump blood around the body.
The basic structure of the heart, may be described as follows :
The Heart is divided into separate right and left sections by the interventricular septum, or “septum” when the context is clearly that of the heart. Each of these (right and left) sections is also divided into upper and lower compartments known as atria and ventricles, respectively.

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