The Endocrine System

1
The Endocrine System

• Broadcasting throughout the body!

2
PURPOSE of Endocrine System

• GLANDS RELEASE PRODUCTS (HORMONES) INTO
  BLOODSTREAM
• PRODUCTS (HORMONES) BROADCAST MESSAGES TO BODY
  LIKE A RADIO BROADCAST

3
GLANDS

• PRODUCE AND RELEASE SUBSTANCES OR SECRETIONS
• EXOCRINE GLANDS
• SECRETE SUBSTANCES THROUGH DUCTS
• EX SWEAT AND TEARS
• ENDOCRINE GLANDS
• RELEASE SECRETIONS (HORMONES) DIRECTLY INTO BLOOD
  STREAM

4
HORMONES

• ACT AS THE BROADCASTERS BY FLOWING THROUGH
  BLOODSTREAM
• AFFECT ACTIVITY OF OTHER CELLS
• TARGET CELLS
• CELLS THAT HAVE RECEPTORS FOR A PARTICULAR
  HORMONE
• WHAT HAPPENS IF A TYPE OF CELL DOES NOT HAVE
  RECEPTORS??
• CELL WILL NOT RESPOND TO THAT HORMONE!
• Ex. Testosterone will not affect heart cells,
  but adrenaline will
• SLOWER AND LONGER-LASTING THAN NERVE RESPONSES

5
CONTROL OF THE ENDOCRINE SYSTEM

• REGULATED BY FEEDBACK MECHANISMS
• EX HEATING SYSTEMS

6
CONTROL OF ENDOCRINE CONT

• ACTUAL EXAMPLES IN BODY
• CONTROLLING METABOLISM
• HOW DOES OUR BODY REGULATE CELL ACTIVITY?
• MAINTAINING WATER BALANCE
• HOW DO WE KEEP FROM GETTING DEHYDRATED?
• USING THE SHEET I GAVE YOU AND YOUR TEXTBOOKS,
  FILL IN THE INFO ON THESE TWO FEEDBACK
  MECHANISMS!