| Action
of the Semilunar Valves |
| Ventricle
contracting, |
||
| valve open,
blood |
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| flows
into arteries. |
||
| Ventricle
relaxes, |
||
| backflow
of blood |
||
| closes valve. |
||
| valve |
||
| cusp |
||
| Semilunar |
||||
| closing |
||||
| produces the |
||||
| second heart |
||||
| sound. |
||||
| ventricle |
| ventricle |
