BIO 1140 Lecture Notes - Lecture 8: Signal Transduction, Endocrine System, Lipophilicity
26 Apr 2016
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Document Summary
Within a multicellular organism, the activities of individual cells are directed by molecular signals (ie. hormones) that are released by controlling cells. Each receiving cell has receptors that are specific to recognize only a few of these many signal molecules. When a cell binds a signal mol- ecule via a receptor, it modifies its internal activities in accordance with the signal, coordinating its functions with the activities of the other cells in the organism. This total network of signals and responses allows multicellular organisms to grow, develop, reproduce and compensate for changes in an in- environmental nated fashion. ternally coordi- Conserved mechanisms are velopment, immu- essential for de- cell growth/sur- nity, physiology, monal regulation vival and hor- and homeosta- sis. Mineralocorticoids (aldosterone): act on water/minerals in the cell. One domain of steroid hormone receptors recognizes and binds a specific steroid hormone, changing its shape.
