lecture_10-1-2

lecture_10-1-2 - processes so levels of hormones are...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
control of female reproductive behavior Females have reproductive stages just as males do: Courtship & nest-building Egg-laying Incubation Maternal care Incubation and maternal care are absent in polyandrous groups There are two main behaviors associated with courtship and nestings: Nest-building Copulation solicitation displays Both are estrogen-dependent Again, we have the HPG axis, this time involving the single ovary in the female instead of the testes in the male. In particular, sex steroids in the females are synthesized and released by growing ovarian follicles within the ovary. Supportive cell layers called the granulosa and theca layers produce: Progesterone Estrogen Androgens (including testosterone, dihydrotestosterone, androstenedione) Each of these hormones is synthesized from a cholesterol molecule. Parts of the cholesterol molecule are cleaved to yield different steroid structures,that have different functions. The hormones are formed from one another through cleavage
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: processes, so levels of hormones are interrelated: Cholesterol & Progesterone & Testosterone & Estrogen We can again characterize sex steroids in the female in a similar seasonal manner as with the male – sex steroids are highest during the breeding season and at lower levels at all other times. If we focus on only the breeding season, we see that there is an intrinsic pattern of hormone production that, in the female, is tightly linked to egg production. This tight dependence of egg-production on hormone concentrations is why female sex steroid concentrations are so much more tightly correlated to all reproductive stages, while the male is less so. During the ovulatory process, estrogen, testosterone, and progesterone contribute to follicular maturation and ovulatory processes. All three peak about 4h before ovulation....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern