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ch45 - Endocrine System x Chapter 45 ~ Chemical Signals in...

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Endocrine System Chapter 45 ~ Chemical Signals in Animals
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Nervous system/Endocrine System OVERLAP! DEFINITIONS Hormone ~ chemical signal secreted into body fluids (blood) communicating regulatory messages Target cells ~ body cells that respond to hormones Endocrine system/glands ~ hormone secreting system/glands (ductless); exocrine glands secrete chemicals (sweat, mucus, enzymes) through ducts OVERLAP 1. Neurosecretory cells ~ actual nerve cells that secrete “neuro”hormones 2. Epinephrine – fight or flight hormone & neurotransmitter; made in adrenal medulla 3. Day/night cycles; reproductive cycles Feedback mechanisms ~ negative and positive
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3 parts of chemical signaling
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3 Hormonal Control Pathways
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Mode of Action: Chemical Signaling 1-Water Soluble Hormones (transport channel in plasma membrane reception) • signal-transduction pathways (neurotransmitters, growth factors, most hormones) 2- Fat Soluble Hormones (Cell nucleus reception) • steroid hormones, thyroid hormones, some local regulators; ex: estrogen/progesterone
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