Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: The vagina is a tube-like structure about 9 centimeters (3.5 inches) long. It begins at the vulva and extends upward to the uterus. It has muscular walls lined with mucous membranes. The vagina has two major reproductive functions. It receives sperm during sexual intercourse, and it provides a passageway for a baby to leave the mother's body during birth. Answer: the uterus
A:
The vagina starts at the vulva and ends where?