LIFESCI 7C Lecture 1: LS 7C Week 1 lecture 1
Document Summary
Only cells that have receptors for the hormone respond to the signal. Therefore, signaling can be specific for particular cells. receptor activation the turning on of a receptor, which often occurs when a signaling molecule binds to a receptor on a responding cell. The signal usually activates the receptor by causing a conformational change in the receptor. As a result, some receptors bind to and activate other proteins located inside the cell. During signal transduction, one molecule activates the next molecule, which activates the next, and so on. The last step is termination, in which the cellular response is stopped. The response can be terminated at any point along the signaling pathway. Termination protects the cell from overreacting to existing signals and therefore helps the cell to have an appropriate level of response. It also allows the cell to respond to new signals. http://www. macmillanhighered. com/brainhoney/resource/6716/digital_first_content/trunk/test/morri s2e/asset/img_ch9/morris2e_ch09_fig_09_03. jpg. 9. 2 http://www. macmillanhighered. com/brainhoney/resource/6716/digital_first_content/trunk/test/morri s2e/asset/img_ch9/morris2e_ch09_fig_09_04. jpg endocrine signaling signaling by molecules that travel through the bloodstream.
