When the muscular
wall of the right
ventricle contacts,
the blood inside the
heart chamber is put
under more pressure,
and the tricuspid
valve closes.
As a result,
he only exit is through
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.
The pulmonary vein
travels parallel to the pulmonary
artery as it carries
the blood back up to the heart. |
