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Unformatted text preview: MCB 32 Professor Andrew E. Wurmser 9/30/07 Lecture 2 Sharing or distribution of lecture notes, or sharing of your subscription, is ILLEGAL and will be prosecuted. Our non-profit, student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. Sharing or copying these notes is illegal and could end note taking for this course Announcements --Omar was the GSI assigned to sec. 111 and 112. We might have to cancel those sections because we have not seen or heard from him as of yet. --I will be posting my office hours soon, probably on Friday. Brief Review: -Water can dissociate into hydrogen ions and hydroxyl ions. Water has some pH because of this ability. -pH is inversely proportional to the level of hydrogen ions. That is, the more hydrogen ions, the lower the pH. Remember that low pH is associated with acidity. - We talked about buffers last time. There are certain buffers that can maintain a stable pH in the blood. -Remember that negative feedback loops maintain equilibrium by counteracting the effect of the initial stress. -Ive had some questions about positive feedback loops. Let me clarify by saying that positive feedback loops amplify signals. Very small signals large signals. Thus, instead of counteracting the effect of the initial stress, positive feedback loops amplify the initial stress. Example 1: oxytocin promotes uterine contraction, which causes more oxytocin to be secreted....
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- Fall '07