04-HormonesS11b - Hormones & Homeostasis Lecture...

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Lecture 11/Chapter 9 & 46
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Homeostasis : maintaining a constant internal environment of the organism Interact with environment Can respond to changes but return to “normal” Can operate in a broad range of conditions Part of homeostasis is getting individual cells to act as a unit (tissues or organs) Coordinate growth, position, movement, function Each cell influences cells around them—no cell act alone (under normal conditions) 2
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Cellular communication To accomplish homeostasis and multicellular unity, cell must communicate Communication accomplished through: an interplay of direct contact, and autocrine, paracrine, endocrine and neuronal, signaling 3 Figure 46.1
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Autocrine signaling Autocrine signaling :a cell regulating its own fate and function Communication between organelles Signaling molecule = 4
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Direct contact Direct contact :cells communicate by direct touching molucules on adjacent cells Signaling molecule = 5 See also Figure 9.2
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Paracrine signaling : signal released from a cell has an effect on
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This note was uploaded on 04/25/2011 for the course BIOL 111 taught by Professor Dr.zielinski during the Spring '08 term at Purdue University-West Lafayette.

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04-HormonesS11b - Hormones & Homeostasis Lecture...

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