CSB325H1 Lecture Notes - Organization Of Ukrainian Nationalists, Hypotension, Leptin
15 Sep 2014
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Document Summary
Served as a mechanism for cell- to- cell communication any molecule excreted by one cell to another = bioregulator/hormone. Bioregulator organization chemical communication involves neurocrines (neurotransmitters or neuromodulators) and neurohormones, hormones, and autocrine/paracrine regulators. Autocrine and paracrine signaling networks. Intracrine signaling like 2 receptors binding to each other. Molecules that transfers information/signal between organelles in a cell. Endocrine and exocrine signal transmission. First cells and signaling ability. Symbiotic cells increase of complexity. Signaling in primitive extant metazoans. More evolved systems: autocrine/paracrine mechanisms juxtacrine mechanisms. Placozoa and sponges as models of early metazoans role of extracellular matrix. Epithelial cells of the sponges are capable of transmitting signals. Cilia, associated with a ring of photoreceptive cells at the base of the larve act to propel the organism away from sunlight. Reprinted with permission from leys and degnan (2001) biol. Formation of the nerve net with neurons and neurosecretory cells larvae reacts to light.
