Scientists have created images of the heart's muscular layer that show, for the first time, the connection between the configuration of those muscles and the way the human heart contracts. More ...
Verywell Health on MSN
Vagina anatomy, function, and what's normal
Medically reviewed by Monique Rainford, MD Key Takeaways The vagina is a muscular tube connecting the outside of the body to the uterus. The vagina expands and produces more lubrication when aroused.
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