В теле 590 с лишним мышц, работа которых способствует циркуляции крови.
С лишним - more than?
Способствуют - contribute or make for or another one?
There's are some 590-odd muscles whose sole function is that of supporting/aiding in circulation.
There are 590+ muscles in the body whose only job is to help/support circulation.
Thanks for the help!
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