Ch. 39-1 & 39-2: I. Endocrine System. FUNCTION : Transmit chemical messages to control growth, development & metabolism. Question Time!. The endocrine system transmits chemical messages to: Control growth Control metabolism Fight off antigens All of the above A & B. A. Hormones & Glands.
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FUNCTION: Transmit chemical messages to control growth, development & metabolism
The endocrine system transmits chemical messages to:
Hormone = secreted chemical in blood stream or ducts that affects cells
Ex: Human growth hormone (HGH), insulin
Gland = organ that releases hormones into body
Message delivered throughout the body
Body’s response is slower than nerve impulse
C. Two Gland Types:
1)EXOCRINE gland – secrete substance through ducts(Ex: sweat, tears)
2) ENDOCRINE gland – secretes hormones into bloodstream
The exocrine gland secretes hormones into bloodstream and the endocrine gland secretes substances through ducts.
True or False
D. Endocrine Glands:
1.Pituitary gland (in brain)
2. Thyroid (in neck)
3. Adrenal glands (above each kidney)
Which statement is not true?
Thyroid glandcontrolled by hypothalamus & pituitary gland
Hypothalamus sense low levels of thyroxine in blood & sends a message to pituitary releases hormone
Signals the thyroid to produce & release thyroxine
Thyroxine sent to cells to speed metabolism
Low Hormone Level
Decrease Hormone Production
Increase Hormone Production
High Hormone Level