PSCI 11D - Week 1, Biological Changes of Puberty

Endocrine System

The system of the body that produces, circulates, and regulates hormones.

Kisspeptin

A brain chemical believed to trigger the onset of puberty

Leptin

A protein in our body that tells our body when we have enough fat.

Puberty

The period of adolescence transitioning to sexual maturity. 

Adrenarche

The phase of maturation in the adrenal glands – when puberty is first turned on. 

When does adrenarche start?

Around 9-10 years old

Why is the endocrine system essential to puberty/adolescence?

To regulate and monitor certain hormones from the central nervous system

Pituitary gland

The main gland in the endocrine system; facilitates growth and development

Gonads

Glands that secrete sex hormones. 

What are parts of the endocrine system and the hormonal feedback loop?

• Hypothalamus

• Pituitary glands

• Gonads

• Sex hormones (androgens and estrogens)

Melotonin

A hormone that contributes to sleepiness and the trigger of onset puberty.

What triggers pubertal maturation?

Kisspeptin triggers the onset of puberty, and is stimulated by the protein of leptin and melatonin in the body

Why is leptin important in puberty development?

• Leptin is needed to help the body regulate hunger and appetite

• Leptin is essential for women in order to develop the correct body weight to carry a child

What are the earliest stages that both genders fully go through puberty?

• Females: ~age 10

• Males: ~age 12