Lecture 3 objectives.doc

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Lecture 3 objectives 1. Illustrating with simple diagrams , explain the four ways in which cells talk to each other (nervous, endocrine, paracrine, autocrine). Nervous- When neurotransmitters diffuse across the synaptic cleft between axon terminals of the presynaptic neuron and the membrane of the postsynaptic neuron or target cell. Endocrine- Non-neuronal cells that release chemical messengers (hormones) into the blood stream, which carriers the messengers to various “target” tissues. Paracrine- Chemical messengers diffuse through the extracellular fluid to neighboring target cells. These are important in the immune system. Autocrine- The cells responds to the chemical messenger it secreted itself. 2. Give examples of signalling molecules involved in each of the above modes of communication (e.g. serotonin, cortisol). Oxytocin, thyroxine, estrogen, testosterone, cortisol, aldosterone 3. Illustrate how endocrine glands differ from exocrine glands (BIO 203) 4. List all the organs that are purely endocrine, and have no other function.
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