BIL 360 Lecture Notes - Lecture 9: Heterothermy, Sympathetic Nervous System, Thermogenesis
22 Apr 2017
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Thermogenesis: creating heat: 2 processes, shivering: unsynchronized contraction, relaxation of skeletal muscle in high frequency rhythm. Use atp to liberate heat energy to bring back to core temp and increases metabolism: non-shivering thermogenesis: brows fat (adipose tissues) oxidizes stored lipids at a high rate, resulting in heat production. Placental mammals also in young of some species of birds. Very well vascularized, and well supplied by blood vessels. Many hibernating species of animals and newborns. This small difference limits the driving force for heat transfer. Sweating is an evaporative process, but can be very dangerous in terms of water balance: last resort. Animals adapted to hot, dry environments first use nonevaporative mechanisms of cooling. Controlled hyperthermia: allowing temp to become very warm which promotes heat loss by changing the driving force. If ambient temp is quite hot and body temp cooler this will favor heat going into body.
