Developmental biologyLesson 3 of 3 in the course Animal Reproduction and Development

Human Reproduction: Anatomy, Gametogenesis, Hormones, Pregnancy, and Labor

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Human reproduction depends on specialized organs that produce and transport gametes, support fertilization, and—in the female reproductive system—support pregnancy and birth. Male and female reproductive structures begin from similar embryonic tissues and develop along different pathways.

Early in development, reproductive tissues in embryos are similar. Around the seventh week of gestation, testosterone released by the developing gonads can direct tissues toward male reproductive anatomy. In the absence of this testosterone signal, the tissues develop along the typical female pathway. Some structures have corresponding developmental origins: tissue that forms the penis can form the clitoris, and tissue that forms the scrotum can form the labia.

All flashcards

What are seminiferous tubules?
Coiled tubes within the testes where sperm develop.
What is the role of the epididymis?
It is the site where sperm mature after leaving the seminiferous tubules.
What is the acrosome?
A structure at the tip of a sperm cell’s head containing enzymes that help the sperm pass through the egg’s protective coverings.
What does the corpus luteum produce?
It produces estrogen and progesterone after ovulation; progesterone helps maintain the uterine lining.
What is the endometrium?
The inner lining of the uterus, which thickens before implantation and is partly shed during menstruation if pregnancy does not occur.

Quiz questions

  1. How many sperm can one primary spermatocyte produce through meiosis?Answer: Four sperm cells.
  2. When does a secondary oocyte complete meiosis II?Answer: After a sperm fertilizes it.
  3. What is the main role of β-HCG early in pregnancy?Answer: It maintains the corpus luteum.
  4. How can the placenta provide passive immunity to a fetus?Answer: By transferring some maternal immunoglobulins across the placenta.
  5. What makes labor contractions a positive-feedback loop?Answer: Contractions stretch the cervix, prompting signals that strengthen contractions.

Based on Concepts of Biology by Samantha Fowler, Rebecca Roush, James Wise (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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