Ch 39 1 39 2 i endocrine system
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Ch. 39-1 & 39-2: I. Endocrine System PowerPoint PPT Presentation


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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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Ch. 39-1 & 39-2: I. Endocrine System

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Ch 39 1 39 2 i endocrine system

Ch. 39-1 & 39-2: I. Endocrine System

FUNCTION: Transmit chemical messages to control growth, development & metabolism


Question time

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

A. Hormones & Glands

Hormone = secreted chemical in blood stream or ducts that affects cells

Ex: Human growth hormone (HGH), insulin

Gland = organ that releases hormones into body


B compared to nervous system

B. Compared to nervous system

Message delivered throughout the body

Body’s response is slower than nerve impulse


Ch 39 1 39 2 i endocrine system

C. Two Gland Types:

1)EXOCRINE gland – secrete substance through ducts(Ex: sweat, tears)

2) ENDOCRINE gland – secretes hormones into bloodstream


Question time1

Question Time!

The exocrine gland secretes hormones into bloodstream and the endocrine gland secretes substances through ducts.

True or False


Ch 39 1 39 2 i endocrine system

D. Endocrine Glands:

1.Pituitary gland (in brain)

  • most important

  • regulates other glands

2. Thyroid (in neck)

  • makes thyroxine; regulates metabolism


Ch 39 1 39 2 i endocrine system

3. Adrenal glands (above each kidney)

  • makes epinephrine(adrenaline) ; response to stress

4. Pancreas

  • makes insulin; regulates glucoselevels


Question time2

Question Time!

Which statement is not true?

  • Adrenal gland responds to stress

  • Thyroid regulates glucose levels

  • Pancreas makes insulin

  • Pituitary regulates other glands


E feedback mechanism

E. Feedback Mechanism

  • adjusts to regulate hormone levels

  • maintains HOMEOSTASIS


Ex thyroid thyroxine

Ex. Thyroid  thyroxine

Thyroid glandcontrolled by hypothalamus & pituitary gland

Hypothalamus sense low levels of thyroxine in blood & sends a message to pituitary releases hormone


Ch 39 1 39 2 i endocrine system

Signals the thyroid to produce & release thyroxine

Thyroxine sent to cells to speed metabolism


Ch 39 1 39 2 i endocrine system

Low Hormone Level

Decrease Hormone Production

Increase Hormone Production

High Hormone Level


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