CAS BI 315 Lecture Notes - Lecture 6: Brown Adipose Tissue, Food Energy, Vasomotor
Document Summary
Feeding occurs at distinct intervals, but body metabolism must remain fairly stable throughout the day. Run out of glucose quickly, most of the cells run on fatty acids. The rate at which animals consume energy (convert food energy to heat+ work) is their metabolic rate. Bmr is our minimal metabolic rate while resting and in out thermoneutral zone. The warmer you get the more the insulation is reduced. Low energy mechanisms of thermoregulation by changing insulation in humans. Blood circulation core body heat more peripheral blood flow(peripheral vasoconstriction) conserve core heat. Posture change: ex- hunch back and hand in pockets when hot. Behavior changes: ex- changing amount of clothing, goosebumps. Just generate metabolic heat from the reactions used to power the contractions. Non shivering thermogenesis- direct production of heat from food energy in brown fat. Active evaporative cooling( seating) : it takes a lot of enrgy and you lose water and solute.
