Pulmonary Trunk

The pulmonary trunk is a blood vessel which divides to form the right and left pulmonary arteries. At the base of this trunk is a pulmonary semilunar valve that is made up of three leaflets or cusps. This valve opens when the right ventricle contracts. When the right ventricular muscles relax, blood starts back up the pulmonary trunk, causing the valve to close to prevent the flow from returning into the ventricular chamber.


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