Which of the following factors in the female reproductive system helps to guide the sperm to the ovum?
A. A chemical that is released from the lining of the uterus to help the sperm swim to the ovum.
B. The temperature gradient in the female reproductive system in which the sperm tracks the heat of an expectant ovum.
C. An ovum moves at a faster pace when sperm is detected in the uterus.
D. A substance in the fallopian tubes that lubricates the sperm to allow for ease of contact with the ovum.
Answer: B
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