Bio 110, chapter 40 notes pt 2
Bio 110, chapter 40 notes pt 2 Bio 110
University of Louisiana at Lafayette
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This 2 page Class Notes was uploaded by Alexandra Notetaker on Monday October 17, 2016. The Class Notes belongs to Bio 110 at University of Louisiana at Lafayette taught by Dr. Phyllis Griffard in Fall 2016. Since its upload, it has received 3 views. For similar materials see Fundamentals of Biology I in Biology at University of Louisiana at Lafayette.
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Date Created: 10/17/16
Ch 40 notes Homeostasis Homeostasis: cells trying to maintain a constant environment o Includes eating, gas exchange, temperature, salinity, tonicity,and water o Animals have different ways to maintain homeostasis Conformers: maintain the levels of their environment Regulators: go against the environment (requires more energy) Can be osmoregulators or thermoregulators Control systems work similar to a thermostat Can be positive feedback : accelerates a process (rare) Can be negative feedback loop: end product modifies the process/ usually be allosteric regulation Can be feed forward regulation: preparing for a change before it happens o Relies on communication between multiple systems Nervous system: sends immediate signals Endocrine: sends hormones, more of a long term signal Hormones: chemical messages that act on specific distant cells Paracrine signaling: sends messages to immediate nearby cells o Glucose homeostasis Regulates blood sugar levels/ maintain a constant sugar level The mechanisms restore glucose levels back to the set point Food causes these changes no matter how healthy they are Low levels can occur when the animal hasn’t eaten in a while Integraters: compare signals from sensors to the set point An effector: compensates between the set point and the actual level When sugar levels are too high The pancreas secretes insulin which signals to the liver to turn glucose into glycogen by dehydration reaction When sugar levels are too low The pancreas secretes glucagon which signals to the liver to break by glycogen to glucose by hydrolysis This process uses a negative feedback loop Not integrated by the brain The sensors are the pancreas The effectors is the liver Type one diabetics don’t make insulin