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Slow sperm may fail at crashing ‘gates’ on their way to an egg

Narrow spots in the female reproductive tract could help weed out less desirable suitors

sperm

SWIM MEET  Sperm face many obstacles along the way to an egg, including narrow points in the female reproductive tract that help sort out the top swimmers.

Panther Media GmbH/Alamy Stock Photo

By Aimee Cunningham

- More than 2 years ago

The female reproductive tract is an obstacle course that favors agile sperm.