Cell Communication and Multicellularity

7.1

You should be able to

• Use the source and distribution mechanism of a signal to identify the type.
• Give an examle of how a particular type of signal (autocrine, juxtacrine, paracrine, or hormone) functions in an orgaism
  • Autocrine signals diffuse to and affect the cells tthat make them eg. many tumor cells reproduce uncontrallably because they both make and respond to signals that stimulate cell division.
  • Juxtacrine signals affect only cells right next to and in contact with the cell producing the signal.eg during development when cells are in groups and changing to become specialized.
  • Paracrine signals diffuse to and affect nearby cells. eg in inflammation when the skin is cut
  • Hormones are signals that travel through the circulatory systems of animals or vascular systems of plants.
• …