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22 year old male bodybuilder visits hospital because he believes to be…

- - - - Depression.
      - Headaches.
      - Anxiety.
      - Trouble concentrating.
      - Insomnia.
      - Lack of appetite.
      - Decreased sex drive.
      - Fatigue.
- - - - Reproduction
      - Growth and development
      - Maintenance of Electrolyte, water, and nutrient balance of blood
      - regulation of cellular metabolism and energy balance
      - mobilization of body defenses
    - - Initiates responses slowly
      - long duration responses
      - Acts via hormones released in blood
      - Acts at diffuse locations targets can be anywhere blood reaches
      - Hormones act over long distances
  - - - A hormone typically produces one or more of the following changes
        
        Alters plasma membrane permeability or membrane potential, or both by opening and closing ion channels
        
        Stimulates synthesis of enzymes and other proteins within the cell
        
        Activates or deactivates enzymes
        
        Induces secretory activity
        
        Stimulates mitosis
  - - - some internal and external stimulus triggers hormone secretion. As levels of a hormone rise, it causes target organ effects, which then feedback to inhibit further hormone release.
    - - for example insulin which is released in response to increased blood glucose and aldosterone which is released in response to low Na+ or high K+ blood levels
    - - for example of neural stimuli is the response to stress, in which the sympathetic nervous system stimulates the adrenal medulla to release norepinephrine and epinephrine.
    - - for example releasing and inhibiting hormones produced by the hypothalamus regulate the secretion of most anterior pituitary hormones and many anterior pituitary hormones in turn stimulate other endocrine organs to release their hormones.