Bio Notes Chapter 9 - Chapter 9 Cell Communication What is...

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Growth factors Epidermal GF -Hormone encodrine secretion travel long distances EGF binds to surface receptor Inc. gene expression Chapter 9: Cell Communication What is communication? Why do cells do it? Producing, detecting and responding to signals. Signal : an agent that “influences cell properties” or causes change in a target cell. Sponges have several cell types organized in a distinct arrangement Multicellularity requires cell communication All cells communicate with their environment (Fig 9.1) o Yeast senses glucose with receptors. o Cell Synthesizes membranes, transporters and enzymes Signal: an “agent” that affects a cell Could be for example, a molecule or a force Cells receive signals and send them 1a) Direct Intracellular Signaling (Fig 9.3a) Animal cells have gap junctions Direct cell-cell connection via protein channels Ions and small molecules (sugars, amino acids) pass through 1b) Direct intracellular signaling (Fig 10.15) Plant cells have plasmodesma o Different structure than gap junction Contains tubule connecting ER of adjacent cells. Same function as gap junction 2) Contact dependent signaling (Fig 9.3b) Requires cell-cell contact.
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