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Explain Terms Pressure Semilunar Valves Open.  Mark Greater

Semilunar valves open when the pressure below the valve, in the ventricle, is greater than the pressure in the artery.

Semilunar valves open when the pressure below the valve, in the ventricle, is greater than the pressure in the artery.

Front Explain, in terms of pressure, why the semilunar valves open. 
( 1 mark)
Back Pressure is greater below valve/in ventricle than (artery);

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