Transcript The Endocrine System Broadcasting throughout the body! PURPOSE of Endocrine System • GLANDS RELEASE PRODUCTS (HORMONES) INTO BLOODSTREAM • PRODUCTS (HORMONES) BROADCAST MESSAGES TO BODY LIKE.

The Endocrine System
Broadcasting throughout the body!
PURPOSE of Endocrine System
• GLANDS RELEASE PRODUCTS
(HORMONES) INTO BLOODSTREAM
• PRODUCTS (HORMONES) BROADCAST
MESSAGES TO BODY LIKE A RADIO
BROADCAST
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
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
CONTROL OF THE ENDOCRINE
SYSTEM
• REGULATED BY FEEDBACK MECHANISMS
– EX: HEATING SYSTEMS
FURNACE
KICKS
OFF
ROOM
COOLS
DOWN
ROOM
WARMS
UP
FURNACE
KICKS
ON
CONTROL OF ENDOCRINE CON’T
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!