ani phys lecture 11-20

ani phys lecture 11-20 - Animal Physiology Lecture...

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Animal Physiology Lecture 11-20-2007 Biological Rhythms Hamsters since the 1950’s have been the animal of choice to study daily rhythm…pg 36…12 hr dark and 12 hr light cycles…hamsters on wheel in cage…concept of free running is what happens when the lights are off at all times…no light cycles…the animal maintains the rhythm but begins somewhere between 20-30 minutes earlier every night…the clock is no longer “entrained”…this region is free running…”zeitgeber”—time giver…something that retrains the clock…the clock is reset by light…everyday you will retrain your clock… Animals are changing every day when they get turned on and shifting the free running stage 1) Retinal hypothalamic tract RHT : major player in activating SCN because it is the only glutamatergic nerve… 2) Internal geniculus nucleus IGL or the lateral geniculus : vision processing center…those from the optic nerve feed into this area…main NT is GABA…GABA is going to regulate the
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ani phys lecture 11-20 - Animal Physiology Lecture...

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