Chapter 18
The Endocrine System
•Endocrine and nervous systems work together
•Endocrine system
–hormones released into the bloodstream travel
throughout the body
–results may take hours, but last longer
• Nervous system
–certain parts release hormones into blood
–rest releases neurotransmitters excite or inhibit
nerve, muscle & gland cells
–results in milliseconds, brief duration of effects
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