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        ~short chains of amino acids        – Oxytocin |  
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        Term 
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        Definition 
        
        ~A chemical messengers released by a cell that can act back on the cell, on neighboring cells, or on distant cells via the blood stream to alter their function. ~regulate all cellular processes and allow  cells to respond to changes in their environment ~ effects can be rapid (oxytocin) or sustained (testosterone) ~allow animals to alter their metabolic  investment in productive functions ~primary regulators of animal growth and  development |  
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        Term 
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        Definition 
        
        ~long chains of amino acids ~Ex: Growth Hormone, Insulin |  
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        Term 
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        Definition 
        
        | Thyroxin, melatonin, epinephrine |  
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        Term 
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        Definition 
        
        ~Cholesterol metabolites  ~EX: Testosterone, Estrogen, Progesterone, Cortisol |  
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        Term 
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        Definition 
        
        ~glycosylated proteins EX:Luteinizing hormone, Follicle stimulating hormone |  
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        Term 
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        Definition 
        
        ~arachidonic acid metabolites EX: Prostaglandin F, Prostaglandin E |  
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