BIO315H5 Chapter Notes - Chapter 15: Invertebrate, Kaic, Dishevelled
Document Summary
Bio 315 chapter 15 cell signaling. Bacteria respond to chemical signals secreted from their neighbors via quorum sensing. Some esm need the target cell to contact it, this is called contact-dependent signaling. It can occur over long distances with the target cell extending long, thin processes. The signaling cells secret signaling molecules (local mediators) into its local environment (only local cells can receive the signal) Autocrine signaling (subsect) when the same cell responds to its own signaling molecules (such as cancer cells which secret signaling cells to themselves to promote proliferation: synaptic. For multicellular organisms that need long-range signaling mechanisms we have nerve cells. The cells extend their long axons; at the terminal end of the axon, a chemical synapse is formed between the axon and the target cell. When the neuron is activated by a stimulus from the axon, impulses are sent to through the axon until it reaches the synapse.
