Respiration; buccal and opercular pumps
Respiration; buccal and opercular pumps
Respiration; buccal and opercular pumps
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Diagrammatically, we can express the pressure relationships as follows:<br />
Phase 1: The Opercular Suction Pump: both the <strong>buccal</strong> <strong>and</strong> <strong>opercular</strong><br />
cavities exp<strong>and</strong> creating negative pressure in both cavities. But, as these volume<br />
expansions take place, there is strong differential pressure, the <strong>opercular</strong> cavity<br />
being considerably more negative than the <strong>buccal</strong> cavity. Water is sucked in<br />
through the mouth (the <strong>buccal</strong> or oral valve). The <strong>opercular</strong> opening (<strong>opercular</strong><br />
valve) is held tightly closed.
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