Sperm obstacle course

However, in vitro fertilization has demonstrated that capacitation of sperm once considered one of the greatest problems in successfully achieving test-tube babies can occur in relatively simple, nonspecific fluids available in any laboratory. These microscopic canals leading from the uterus into the fallopian tubes are only about one-seventieth of an inch in diameter the size of a pinpoint.

As sperm approach a narrow part in the female reproductive tract, the fast flow of fluid can push them back red arrows. The vagina is an elastic canal, about four to five inches long.

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