Computer generated animation of cut section of the human heart showing both ventricles.
A ventricle is one of two large chambers toward the bottom of the
In a four-chambered heart, such as that in
Ventricles have thicker walls than atria and generate higher
On the inner walls of the ventricles are irregular muscular columns called
The right ventricle is equal in size to the left ventricle[
Its posterior wall is formed by the
The left ventricle is longer and more conical in shape than the right, and on transverse section its concavity presents an oval or nearly circular outline. It forms a small part of the sternocostal surface and a considerable part of the diaphragmatic surface of the heart; it also forms the apex of the heart. The left ventricle is thicker and more muscular than the right ventricle because it pumps blood at a higher pressure.
The right ventricle is triangular in shape and extends from the tricuspid valve in the right atrium to near the
By early maturity, the walls of the left ventricle have thickened from three to six times greater than that of the right ventricle. This reflects the typical five times greater pressure workload this chamber performs while accepting blood returning from the pulmonary veins at ~80mmHg pressure (equivalent to around 11 kPa) and pushing it forward to the typical ~120mmHg pressure (around 16.3 kPa) in the aorta during each heartbeat. (The pressures stated are resting values and stated as relative to surrounding atmospheric which is the typical "0" reference pressure used in medicine.)