-------------------- YOULIBR - Твоё здоровье PDF 2017 MAGAZINES HEALTH tvoe-zdorove-1-2017
MAGAZINES - HEALTH - Твоё здоровье
Твоё здоровье -  2017 PDF ИД Газетный мир MAGAZINES HEALTH
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Твоё здоровье
Year: 2017
Number of pages: 60
Format: PDF
File size: 75 MB
Language: RU

It is known that with each stroke of the heart there is a sequential contraction of its departments - first the atria, and then the ventricles. Only such alternation ensures the effective work of the heart.

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