BIOL 1000 Lecture Notes - Lecture 23: Ethylene, Signal Transduction, Slime Mold
2 Oct 2016
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Document Summary
Cells need to talk (communicate) with one another in order to work together and make things happen. e. g. a muscle contraction results from many nerve cells (neurons) and muscle cells communicating with one another. If a nerve cell (neuron) cannot talk to the muscle cell, no contraction will occur. Extracellular (intercellular) signaling: communication between cells: for example: slime mold aggregation. : communication between internal parts of cell: looking within just one cell. Cells communicate with one another through: direct channels of communication, specific contact between cells, intercellular chemical messengers, important because nothing would happen inside cell and cell would not grow. Direct contact: communicating cells are attached or touching. Local: communicating cells situated near each other. Long distance: communicating cells situated a far away from each other. Cells are in contact (touching) and recognize and communicate via extracellular protrusions (e. g. proteins) Controlling (signaling) cell: synthesizes specific molecule that acts as a signaling molecule to affect activity of the target cell.
