BIOL 118 Lecture Notes - Lecture 11: Cytosol, Guanosine, Enzyme
25 Feb 2017
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Cell-cell gaps: direct connections between cells in tissues, allow cells to work together. Plant cell plasmodesmata (figure 11. 11b: gaps in the cell walls between plant cells, plasma membranes, cytoplasm, and smooth er of the two cells connect. Help coordinate the activity of neighboring cells. Gap junctions (figure 8. 11b: found between cells of most animal tissues, connect adjacent cells by forming protein lined channels, function of gap junctions. Allow the flow of small molecules between cells. Flow of ions through gap junctions can be a signal to coordinate contractions. Chemical signals travel throughout animals and plants to target cells. Transmit information from one tissue or organ to another. Bind to a specific receptor on the target cells. Only cells within the receptor will be affected. But have significant effects on target cell activity. Play a role in coordinating cell activity. In response to information from outside or inside the body. Hormones bind to signal receptors on or in target cells.
