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.
- 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…