Question

What decides whether sperm are allowed into the fallopian tubes?​

Answer 1

Answer:

The test to determine whether your fallopian tubes are open is called a hysterosalpingogram, or HSG. This test is usually done by a radiologist or gynecologist, and places dye through the cervix, into the uterus, and out through the tubes

Explanation:

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Answer 2

Once the sperm have entered the uterus, contractions propel the sperm upward into the fallopian tubes. The first sperm enter the tubes minutes after ejaculation. The first sperm, however, are likely not the fertilizing sperm. Motile sperm can survive in the female reproductive tract for up to 5 days. so nothing “decides” it’s contractions