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Unformatted text preview: Cell I nteractions: I. Introduction: a. To receive a signal, receptor proteins must exist i. In cell membrane or in cell ii. Each receptor protein has a place and shape where it accepts a signal. 1. Name of signals: “ligand” iii. 3 stages: 1. Reception: a. When the receptor protein receives the signal. 2. Transduction: a. The process in between reception and response. The protein sets in motion a chain of events (usually several steps) that eventually leads to the cellular response. 3. Cellular response, when something actually happens as a result of the signal iv. Types of cell signal: 1. Paracrine signaling: a. Very local, signal does not go a long way b. Fig. 9.2 2. Endocrine signaling: a. Hormones are involved, and the signal is sent to a more distant location. 3. Synaptic signaling: b. Signaling from a nerve cell c. Also very local 4. Direct contact: d. Communication through cell junctions, as discussed before....
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