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In the heart, a ventricle is a chamber which collects blood from an atrium (another heart chamber) and pumps it out of the heart.
In a four-chambered heart, such as that in humans, there are two ventricles: the right ventricle pumps blood into the pulmonary circulation for the lungs, and the left ventricle pumps blood into the systemic circulation for the rest of the body.
Ventricles have thicker walls than the atria, and thus can create the higher blood pressure.
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