Briefly describe the mechanism of action of lipid soluble chemical messengers. Include their transport upon reaching their target cell(s), location of their receptors, and how the biological response is realised.
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- Distinguish among the four types of extracellular chemical messengers with regard to their source and the distance to their target cells.Describe the major mechanisms of signal transduction by lipophilic external messengers using internal receptors, and by lipophobic messengers and membrane receptors.Illustrate the Pathways Initiated by Lipid-Soluble Messengers?
- Using the principles of osmosis, explain why movement of Na + through a plasma membrane is followed by movement of water. Use this concept to explain the rationale on which oral rehydration therapy is based.Describe the endogenous lipoprotein pathway.An individual contracts an infection and this results in the production of soluble proteins that act as signalling molecules between cells. Outline and differentiate the various biological activities of these molecules.
- describe five physiological effects which are mediated by G proteinsOutline the three general means by which binding of a water soluble extracellular chemical messenger to its matching surface membrane receptor brings about the desired intracellular response.Second-messenger systems ultimately bring about the desired cell response by inducing a change in the shape and function of particular designated intracellular proteins. (True or false?)