Describe the pathway of the heart’s conduction system and how it relates to the conduction cycle.


 A patient with a malignant cancer of the descending (left-sided) colon and right arm presents to their primary care practitioner with an enlarged lymph node above the right and left clavicles. A biopsy of both lymph nodes detected the presence of metastatic cells. What is the anatomical explanation for cancerous cells being found in that region of the body? 

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