PSYC 304 Chapter Notes - Chapter 13: Neuropeptide Y, Osmosis, Mellitus
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We have a set point of temperature, when temperature lower than it, turn on the heating system, when higher, stop calling for heat. Change external insulation, such as using clothing: 3. Isotonic: having the same concentration of salt that mammalian fluids have: hypertonic is solution with more salt, hypotonic is solution with lower salt. Two internal cues trigger thirst: two different states can signal more water is needed, osmotic thirst, high extracellular concentration of solute, hypovolemic thirst, low extracellular volume due to the loss of body fluids. Increased saltiness of the extracellular fluid: volume of extracellular fluid decrease like respiration, perspiration, urination, lots of salty food makes extracellular more concentrated. Inject some hypertonic solution into hypothalamus causes animals start drinking. Under conditions of prolonged food deprivation, fat can be converted into glucose (process called gluconeogenesis) and a secondary form of fuel, called ketones, which can utilize by body and brain. Insulin is crucial for the regulation of body metabolism.
