Class Notes (835,638)
Canada (509,305)
Biology (1,284)
BIOL 110 (104)
Lecture

Follicle Development

2 Pages
114 Views
Unlock Document

Department
Biology
Course
BIOL 110
Professor
Gordon Dueck
Semester
Fall

Description
Follicle Development/Ovarian Cycle Follicular stage [days1-13]  Anterior pituitary gland is secreting follicle-stimulating hormone FSH  FSH travels in bloodstream to ovary  Stimulates development (division) of follicle cells surrounding oocyte  Developing follicle cells secrete oestrogen  Stimulates proliferation of endometrium and its blood supply  Inhibits further secretion of FSH by negative feedback  Stimulates anterior pituitary gland to secrete luteinising hormone LH  LH brings about ovulation Ovulation [day14] // Mature ovarian follicle ≈15mm in diameter  Mature ovarian follicle bursts and releases secondary oocyte (now called ovum!)  Corpus luteum forms from remaining follicle cells in ovary  Ovum passes down fallopian tube/oviduct towards uterus; fertilization now possible o Happens once a month, menstrual cycle ≈28days o Each ovary alternatively releases an ovum every ≈56days (→56/2) Luteal phase [days15-28]  Corpus luteum secretes sex hormones  Progesterone continues to stimulate o Profileration of endometrium and its blood supply o Development of nutrient fluid glands in uterus lining  High levels of sex hormones inhibit secretion of LSH and LH IF FERTILISATION DOES NOT OCCUR  Corpus luteum degenerates \ levels of sex hormones fall  Uterus lining breaks down; FSH is not inhibited anymore → cycle starts again Uterine Cycle  Menstruation [days1-5] → Endometrium breaks down o Low levels of female sex hormones causes  uterus lining/endometrium to disintegrate  its b
More Less

Related notes for BIOL 110

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit