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img120 - Chapter 5 Learning Module Notes Chemical...

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Unformatted text preview: Chapter 5 Learning Module Notes: Chemical messengers. There are nine multiple choice and two true/false questions assigned to this section . Mai-mufihfiumflm Mmfl~°flk Ont-1m; ”—— —mmwm [E mummmmum annynywmmmw gmmmwum III-send, mural-WW noel-adu- MzfiMMWL-WWW gmwmmum gmmmkmmm. Opening screen: The cells in your body must be able to communicate with one another. When communication is disrupted a break in homeostasis usually follows. One example is insulin dependent diabetes mellitus that is caused by an insufficient amount of a chemical messenger, insulin. Insulin increases cells’ uptake of glucose, and thus too little insulin decreases the amount of glucose available to the cells and this increases blood glucose levels. Cells use only a few mechanisms to communicate with one another. In a few instances they are physically linked by gap iunctions; in most instances, though, they communicate by using chemical messengers. Click the Learning Goals Button: This learning module will provide you with an understanding about how cells communicate, how messengers are synthesized and transported and the different classes of messengers and recqitors “Mimi“ $53 am Click the Home Menu Button :r; m" “M Click the Functional Classification Button: Chemical mama-mm”) manna-mum. "mm" ewmmhmmwm Mme-booths .— 06Wmmmms(h.mm messengers are all referred to as liggms (molecules that bind to proteins reversibly). Wm bind to rm and produce a QAWn-lm'I-WJ-mml response in the target cell through a variety of mechanisms referred to as sigal mguction. c; The M at m In neon-w I: clad don-l Che ' ified in two ways — 1) based on their film and 2) based on their chemin 8mm- The hundreds of chemical messengers are classified into six main functional categories. These include paracrines, autocrines, 9 neurotransmitters, hormones, neurohormones and cytokines. NOTE: There are three concepts you need to unda'stand here. Chemical communication between cells involves the following: 1) A secretory cell that secretes the chemical messenger; 2) this chemical messenger binds to a receptor and 3) this receptor is located on a target cell. MW Dustb- Emu-aw aim—um: (9—...- waauumam—hammu Page 1 of 10 Go to the next screen: Engines-ale chemical messengers released fi'om one cell and bind to a neighboring cell (referred to as the target cell). The target cell must be close enough that once the paracrine is secreted into the extracellular fluid it can it by giggle ...
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