BIO210Y5 Lecture Notes - Tyrosine, Prostaglandin, Thromboxane
Document Summary
The human contains roughly 30 chemical messengers known as hormones, which regulate activities such as sleep, body, temperature, hunger, and stress management. These hormones are products of the endocrine system, which along with the nervous system controls and coordinates our body processes. The endocrine system uses chemical messengers to relay information and instructions between cells. Transmission through gap junctions; must be between two cells of the same type. Mediators ions, small solutes, lipid soluble materials. Distribution usually limited to adjacent cells of the same type that are interconnected by connexons. Paracrine communication use of chemical messengers to transfer information from cell to cell within a single tissue. Distribution primarily limited to a local area where paracrine factor concentrations are relatively high; target cells must have appropriate receptors. Distribution target cells are primarily in other tissues and organs must have appropriate receptors. Distribution limited to very specific area; target cells must have appropriate receptors.
