Hormones

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.

Adrenaline:

• 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…