IB Biology Topic D3.1.5 Changes During the Ovarian and Uterine Cycles and Their Hormonal Regulation Revision Notes (SL/HL)

IB Biology Topic D3.1.5 Changes During the Ovarian and Uterine Cycles and Their Hormonal Regulation Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

The Menstrual Cycle Combines Two Linked Cycles Under Hormonal Control

The menstrual cycle is made of two cycles that run together.
The ovarian cycle controls egg development and release.
The uterine cycle prepares the uterus for a possible pregnancy.

Definition

The Menstrual Cycle

The menstrual cycle is a recurring sequence of physiological changes in the female reproductive system, typically lasting about 28 days, that prepares the body for potential pregnancy.

Four Hormones Drive the Cycle Through Feedback

The cycle is run by four hormones with distinct roles.
FSH and LH
1. Released by the anterior pituitary gland to act on the ovary.
Oestradiol and progesterone
1. Released by the ovary to act on the uterus and feed back to the pituitary.
These hormones interact through positive and negative feedback to control the ovarian and uterine cycles.

Definition

Follicle-Stimulating Hormone (FSH)

Stimulates the growth of ovarian follicles and oestradiol production.

Definition

Luteinizing Hormone (LH)

Triggers ovulation and supports the formation of the corpus luteum.

Definition

Oestradiol

A form of estrogen that promotes the growth of the uterine lining (endometrium) and regulates FSH and LH via feedback loops.

Definition

Progesterone

Maintains the endometrium, preparing it for implantation, and inhibits FSH and LH to prevent new follicle development.

Tip

Do not let the term oestradiol throw you off.
It is the main and most specific form of oestrogen.

The Ovarian Cycle Grows, Releases, and Supports the Egg

Follicular phase (days 1 to 14)

Nice try, unfortunately this paywall isn't as easy to bypass as you think. Want to help devleop the site? Join the team at https://revisiondojo.com/join-us. exercitation voluptate cillum ullamco excepteur sint officia do tempor Lorem irure minim Lorem elit id voluptate reprehenderit voluptate laboris in nostrud qui non Lorem nostrud laborum culpa sit occaecat reprehenderit

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Unlock the rest of this chapter with a free account

The Menstrual Cycle Combines Two Linked Cycles Under Hormonal Control

The menstrual cycle is made of two cycles that run together.
The ovarian cycle controls egg development and release.
The uterine cycle prepares the uterus for a possible pregnancy.

Definition

The Menstrual Cycle

The menstrual cycle is a recurring sequence of physiological changes in the female reproductive system, typically lasting about 28 days, that prepares the body for potential pregnancy.

Four Hormones Drive the Cycle Through Feedback

The cycle is run by four hormones with distinct roles.
FSH and LH
1. Released by the anterior pituitary gland to act on the ovary.
Oestradiol and progesterone
1. Released by the ovary to act on the uterus and feed back to the pituitary.
These hormones interact through positive and negative feedback to control the ovarian and uterine cycles.

Definition

Follicle-Stimulating Hormone (FSH)

Stimulates the growth of ovarian follicles and oestradiol production.

Definition

Luteinizing Hormone (LH)

Triggers ovulation and supports the formation of the corpus luteum.

Definition

Oestradiol

A form of estrogen that promotes the growth of the uterine lining (endometrium) and regulates FSH and LH via feedback loops.

Definition

Progesterone

Maintains the endometrium, preparing it for implantation, and inhibits FSH and LH to prevent new follicle development.

Tip

Do not let the term oestradiol throw you off.
It is the main and most specific form of oestrogen.

The Ovarian Cycle Grows, Releases, and Supports the Egg

Follicular phase (days 1 to 14)

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic D3.1.5: Changes During the Ovarian and Uterine Cycles and Their Hormonal Regulation Notes

The Menstrual Cycle Combines Two Linked Cycles Under Hormonal Control

Four Hormones Drive the Cycle Through Feedback

The Ovarian Cycle Grows, Releases, and Supports the Egg

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

The Menstrual Cycle Combines Two Linked Cycles Under Hormonal Control

Four Hormones Drive the Cycle Through Feedback

The Ovarian Cycle Grows, Releases, and Supports the Egg

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics