AnatomyLesson 2 of 2 in the course The Reproductive System

Reproductive Development: Embryonic Pathways and Puberty

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

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Summary

Reproductive development begins early after fertilization. Although embryos initially share the potential to develop along either a typical male or female pathway, genetic and hormonal signals guide the formation of the gonads and reproductive structures.

In typical development, sex chromosomes include XX or XY. The presence of a Y chromosome usually provides the SRY gene (Sex-determining Region of the Y chromosome), which initiates a sequence of genetic signals associated with testis development. Without a functional SRY signal, the developmental pathway generally proceeds toward ovarian development.

All flashcards

What is the typical role of SRY in reproductive development?
The SRY gene on the Y chromosome typically initiates a genetic cascade that promotes testis development.
How do testicular secretions affect the embryonic reproductive ducts?
Sustentacular cell secretions promote Müllerian duct regression, while testosterone supports Wolffian duct development.
What is the sequence of hormonal signals that coordinates puberty?
The hypothalamus releases GnRH, the anterior pituitary releases LH and FSH, and the gonads respond by producing sex hormones.
How does changing feedback sensitivity help puberty progress?
The hypothalamus and pituitary become less sensitive to sex-steroid negative feedback, allowing gonadotropin levels to rise.
What factors can influence the timing of puberty?
Genetics, environment, psychological stress, nutrition, body fat, and leptin may influence pubertal timing.

Quiz questions

  1. Which structure releases GnRH at the start of the hormonal sequence that coordinates puberty?Answer: The hypothalamus.
  2. Which hormones does the anterior pituitary release in response to GnRH during puberty?Answer: LH and FSH.
  3. What is typically the first visible sign of puberty in females?Answer: Breast development.
  4. What is typically the first physical sign of puberty in males?Answer: Enlargement of the testes.
  5. What are secondary sex characteristics?Answer: Physical traits that develop at puberty but are not reproductive organs.

Based on Anatomy and Physiology 2e by J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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