OBJ: Given notes, video, activity sheet SWBAT explain the structuresa and functions of the Endocrine System with 70% accuracy.

BRING IN TEXTBOOKDN: HW check- Divisions of the Nervous System BookletVideo: Endocrine System

ACT: Introduction to Endocrine System (Notes)Text, read p. 217-221; Work on Endocrine System Booklet.

HW: Complete Endocrine System Booklet; INERH Exam, Monday March 23

Endocrine System Notes• Endocrine System: produces hormones

which controls/regulates organ & tissue activities; regulates growth & development.

(keeps the human organ systems in balance / stability / harmony . . . . homeostasis)

Endocrine System NotesEndocrine System Organs:

• Hypothalamus (middle brain): linked to Nervous System; maintains homeostasis & control of pituitary gland.

• Pituitary Gland: growth, blood pressure, water balance regulates; signals thyroid gland to produce hormones.

• Thyroid Gland: produces hormones; controls energy inside cell

• Parathyroid: regulates blood calcium.

Endocrine System Notes

Endocrine System NotesEndocrine System Organs:• Thymus: helps immune system

development• Pancreas: controls blood sugar• Adrenal (above kidneys): triggers

adrenaline during emergency situations; “fight or flight response”.

• Ovaries: triggers egg development (estrogen); female sexual development (progesterone).

• Testes: regulates sperm development; male sexual development (testosterone)

Endocrine System Notes

Endocrine System NotesEndocrine System:

controls/regulates → negative feedback

The Endocrine System uses a negative feedback loop (like a home thermostat) to maintain homeostasis.

Through negative feedback, when the amount of a specific hormone in the blood reaches (rises) to a certain level, the hypothalamus sends a signal to stop the release of that hormone (homeostasis). If the hormone level drops, a signal is sent to the hypothalamus to release the hormone.

NEGATIVE FEEDBACK LOOP

Hormone

Endocrine System Notes