IB Biology Topic D3.1.13 Control of the Developmental Changes of Puberty Revision Notes (HL)

IB Biology Topic D3.1.13 Control of the Developmental Changes of Puberty Revision Notes (HL) | RevisionDojo

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GnRH from the Hypothalamus Triggers the Hormonal Cascade of Puberty

Puberty begins when the hypothalamus increases its secretion of gonadotropin-releasing hormone (GnRH).
This peptide hormone is released in pulses, which is critical for its effect.
GnRH acts on the anterior pituitary gland, triggering the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
FSH and LH stimulate the gonads to produce sex hormones, which drive the physical changes of puberty.

Definition

Gonadotropin-Releasing Hormone (GnRH)

GnRH is a peptide hormone secreted by the hypothalamus in the brain. It regulates the reproductive system by stimulating the anterior pituitary gland to release two key hormones: luteinizing hormone (LH) and follicle-stimulating hormone (FSH).

Note

GnRH is released in pulses, not continuously.
This rhythmic release is what keeps the pituitary responsive and able to secrete LH and FSH.

LH and FSH Act on the Gonads to Produce Gametes and Sex Hormones

Luteinizing hormone (LH)
1. In males, LH stimulates the testes to produce testosterone.
2. In females, LH triggers the ovaries to produce oestrogen and drives ovulation during the menstrual cycle.
Follicle-stimulating hormone (FSH)

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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.

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GnRH from the Hypothalamus Triggers the Hormonal Cascade of Puberty

Puberty begins when the hypothalamus increases its secretion of gonadotropin-releasing hormone (GnRH).
This peptide hormone is released in pulses, which is critical for its effect.
GnRH acts on the anterior pituitary gland, triggering the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
FSH and LH stimulate the gonads to produce sex hormones, which drive the physical changes of puberty.

Definition

Gonadotropin-Releasing Hormone (GnRH)

Note

GnRH is released in pulses, not continuously.
This rhythmic release is what keeps the pituitary responsive and able to secrete LH and FSH.

LH and FSH Act on the Gonads to Produce Gametes and Sex Hormones

Luteinizing hormone (LH)
1. In males, LH stimulates the testes to produce testosterone.
2. In females, LH triggers the ovaries to produce oestrogen and drives ovulation during the menstrual cycle.
Follicle-stimulating hormone (FSH)

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 D3.1.13: Control of the Developmental Changes of Puberty Notes

GnRH from the Hypothalamus Triggers the Hormonal Cascade of Puberty

LH and FSH Act on the Gonads to Produce Gametes and Sex Hormones

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

GnRH from the Hypothalamus Triggers the Hormonal Cascade of Puberty

LH and FSH Act on the Gonads to Produce Gametes and Sex Hormones

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