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The endocrine system

  • Hormones travel in the blood
  • Endocrine glads secrete a release hormones directly into the blood
  • Exocrine glands have ducts that carry the secrete hormones
  • Cells that recive hormones must have specific complimentary receptor sites on their plasma membrane. The hormones bind to the receptor
  • Only speific complimentary receptor sites will bind to the target cell.
  • There are two types of hormones- prototien and peptide hormones and steroid hormones.


  • Amino acid derivative hormone- unable to enter target cells.
  • adrenaline receptors on the outside a complimentary to the target cell. 
  • the receptor is associated with ann enzyme on the inner surface of the membrane called adenly cyclase.
  • The adrenaline molelecule is the first messenger
  • Adenly cyclase converts ATP to cyclic AMP- the second messenger
  • cAMP can effect the inside of the cell
  • adrenaline- increases heart rate, dialate puplis, increases mental awarness, increases hearts stroke volume ad produces steroid hormones.

The Pancreas:

  • both endocrine and exocrine functions
  • exocrine function- secreteing digestive enzymes including amylase, trypsinogen and lipase
  • endocrine function- islets of langerhans contain alpha that produce glyucagon and beta cells that…


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