BIOLOGY 2A03 Lecture Notes - Lecture 4: Signal Transduction, Secretion, Autocrine Signalling
4 May 2017
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Document Summary
Hormones - chemical messengers that travel long distances in blood to interact with target cells. Requires the blood to move the substance, the signals are slow acting. Takes a long time for blood to circulate from one part of our body to a distant part. The cell releasing the neurotransmitter is a neural cell, released at a synapse. Act locally between two cells - one that releases the agents and a closer cell that receives it. Autocrine - messenger actually binds back on the same cell - releasing and target cell are the same. Paracrine - secretory cell is different from the target cell. In either case, the target is close to the sender of the message. Induce a response in a cell which is signal transduction pathways - ways of transducing a signal. Take the message from an intracellular messenger and convert it to some important response.
