Ch 11 - Ch 11 Cell to Cell Communication Chapter Objectives...

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Ch. 11 Cell to Cell Communication Chapter Objectives : External signals are converted to responses within the cell Reception, Transduction and response Apoptosis
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External signals are converted to responses within the cell
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Figure 11.2 Exchange of mating factors Receptor D factor a factor Yeast cell, mating type a Yeast cell, mating type D Mating New a/ D cell 1 2 3 a a a/ D D D
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Bacteria : Biofilms
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Local and Long-Distance Signaling Specialized junctions Chemical signalling Hormones
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Figure 11.4 Plasma membranes Gap junctions between animal cells Plasmodesmata between plant cells (a) Cell junctions (b) Cell-cell recognition
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Figure 11.5a Local signaling Target cell Secreting cell Secretory vesicle Local regulator diffuses through extracellular fluid. (a) Paracrine signaling (b) Synaptic signaling Electrical signal along nerve cell triggers release of neurotransmitter. Neurotransmitter diffuses across synapse. Target cell is stimulated.
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Figure 11.5b Long-distance signaling Endocrine cell Blood vessel Hormone travels in bloodstream. Target cell specifically binds hormone. (c) Endocrine (hormonal) signaling Plants : Plant growth Regulators
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Stages of Cell Signaling
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The Three Stages of Cell Signaling: A Preview Reception Transduction Response Earl W. Sutherland
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Figure 11.6-1 Plasma membrane EXTRACELLULAR FLUID CYTOPLASM Reception Receptor Signaling molecule 1
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Figure 11.6-2 Plasma membrane EXTRACELLULAR FLUID CYTOPLASM Reception Transduction Receptor Signaling molecule Relay molecules in a signal transduction pathway 2 1
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Figure 11.6-3 Plasma membrane EXTRACELLULAR FLUID CYTOPLASM Reception Transduction Response Receptor Signaling molecule Activation of cellular response Relay molecules in a signal transduction pathway 3 2 1
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Reception: A signaling molecule binds to a
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