Colonie High AP Biology DeMarco/Goldberg Chapter 41 Chemical Regulation Regulation Why are hormones needed? chemical messages from one body part to another communication needed to coordinate whole body homeostasis & regulation metabolism growth development maturation reproduction growth hormones Regulation & Communication Animals rely on 2 systems for regulation… endocrine system system of ductless glands secrete chemical signals ‘directly’ into blood chemical travels to target tissue slow, long-lasting response nervous system system of neurons transmits “electrical” signal & release neurotransmitters to target tissue fast, short-lasting response Regulation by Chemicals axon endocrine gland receptor proteins target cell Neurotransmitters released by neurons Hormones release by endocrine glands receptor proteins hormone carried by blood neurotransmitter Homology in Hormones prolactin mammals milk production birds fat metabolism amphibians metamorphosis & maturation fish salt & water balance growth & development What does this tell you about these hormones? growth hormone How could this hormone have different effects? Types of Hormones circulating hormones hormones that diffuse into the blood to activate target cells far away local hormones hormones that affect target cells close to their release site autocrine : hormone- releasing cell affected paracrine : hormone affects nearby cells only
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Colonie High AP Biology DeMarco/Goldberg
Chapter 41Chemical Regulation
Regulation
Why are hormones needed?
chemical messages from one
body part to another
communication needed to
coordinate whole body
homeostasis & regulation
metabolism
growth
development
maturation
reproduction
growth hormones
Regulation & Communication
Animals rely on 2 systems for regulation…
endocrine system
system of ductless glands secrete chemical signals ‘directly’ into blood
chemical travels to target tissue
slow, long-lasting response
nervous system system of neurons transmits “electrical” signal &