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How do contraction and relaxation of a...

How do contraction and relaxation of alary muscles help in circulation ?

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The blood floes forward in the heart by the contractions of its chambers . At the anterior end of the heart , the blood flows into the aorta and from there it enters the sinus of the head . From the head sinus , the blood flows into the perivisceral and sternal sinuses . On contraction of the alary muscles the pericardial septum is pulled down . This increases the volume of the pericardial sinus . Hence blood flows from the pericardial septum .On relaxation of the alary muscles , the pericardial septum moves upward to its original position . This forces the blood , to enter the chamber of the heart through the ostia from the pericardial sinus .
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