Why Doctors Call the Calf Muscles the 'Second Heart'\n
The calf does not contain an actual heart, but its muscles play a vital role in circulation, according to Sky News Arabia.

There is no second heart beating in the leg, but calf muscles perform a vital function in blood circulation that has led some specialists to describe them as a “second heart,” Sky News Arabia reported.
Sources
- عضلات الساق.. لماذا يصفها الأطباء بالقلب الثاني؟ — Sky News Arabia — Technology
EGazette summarizes reporting from multiple sources; follow the links for the originals.
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