BIOL 240W 1st Edition Lecture 19Outline of Last Lecture I. Overall ReactionII. Two Main ProcessesIII. Light ReactionsIV. Calvin CycleOutline of Current LectureI. HomeostasisII. EquilibriumIII. Negative Feedback LoopsCurrent LectureI. Homeostasisa. In general, homeostasis consists of the stuff inside your body that keeps things at healthy level.b. Examples of regulated things in our bodies include body temperature, blood pressure, and sodium content in bodily fluid.c. Receptors/devices are constantly monitoring and adjusting to changes.d. Our bodies exist in a dynamic steady state, fluctuating about an average/set point. There is a high limit and low limit outside of the set pointe. Set point ranges vary (broad or narrow)f. Energy must be put into a system to counteract an imbalance outside of the set point range. As long as a system is in the range, no energy will be put in (even if it is not exactly at the set point). II. Equilibriuma. Class example: if you pee in a pool, the pee will not stay in one spot; it will diffuse through the entire pool. The urine and the rest of the pool are at equilibrium. b. In-class activity: a glass of water sitting on a table is in equilibrium. It is in balance, no energy must be put into it as it exists at that moment.c. Water pouring into a bucket and leaked out of the bottom is in homeostasis. The water must be poured into the bucket as water leaks out. d. An empty container is equilibrium. No energy needs to be put into system because it is in balanceThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.e. Two waters balancing (at same level) on a seesaw are in equilibrium. The system is perfectly balanced without the input of energy.f. Water on one end of a seesaw is in equilibrium. It Is tipped over, but no energy needs to be put in to the system.III. Negative Feedback Loopsa. NOT a synonym for homeostasis they are a means/system of maintaining homeostasisb. They compensate for any loss in homeostasis. There are challenges outside and inside the body that could cause a system to lose homeostasis.c.This is an example of a negative feedback loop, although it is not a biological system. When the room temperature decreases, the system works to increase the room temperature.d. There is a sensor/control center and an effector. Whatever set the change in motion, the negative feedback loop works to spit out the reverse of the initial
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