HEART VALVES
 There
are four valves in the heart
- Tricuspid
- Mitral
- Pulmonary
- Aortic
The valves are strong, thin leaflets
of fibrous tissue covered by cells. Although the pumping
action of the heart is effective in ejecting blood from
the chambers, it requires a method to guarantee that
the pumped fluid goes in the desired direction.
The valves are designed to allow blood
to pass in only one direction. They function like a
gate, which opens only when pushed. The valves open
and close in response to the naturally occurring pressure
that build up within the heart's chambers. |
