Endocrine System

Endocrine SystemWhat is the purpose?

• to regulate body activities through the use of chemicals known as hormones

• a hormone is a chemical produced by a gland that affects the activities of other organs or tissues

Endocrine System

Endocrine System• hormones work through a lock-n-key system

Glands and HormonesGland Hormone Affect on the Body

HypothalamusRegulatory chemicals

Regulates the activities of other endocrine glands

PituitaryHGH – human growth hormone

Gonad hormone

Stimulates bone growth

Stimulates development of sex organs

Adrenals AdrenalineIncreases heart rate, blood pressure and breathing rate

Thyroid Thyroxine Increases rate of metabolism

PancreasInsulin

Glucagon

Decreases blood sugar level

Increases blood sugar level

OvariesEstrogen

Progesterone

Produces female secondary sex characteristics

Promotes growth of uterine wall

Testis TestosteroneProduces male secondary sex characteristics

Endocrine System• Negative Feedback System – hormones work

together in opposition; as one increases the other decreases to create a balance

• Example: In the diagram ACTH and Glucocorticoids are working in opposition to control the adrenal response; when the body is stressed more adrenaline is needed