BIO120H1 Lecture Notes - Lecture 2: Melanism, Mpra Language, Thermoregulation
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BIO120H1 Full Course Notes
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Key factor in success = ability for many species to adapt to external environmental fluctuations and maintain a consistent internal environment aka homeostasis! Homeostasis mech = dynamic + regulate many diff parameters in the body (ex. ph, dissolved o2) Internal temp changes may adversely affect physiology (ex. 2 main responses to fluctuating ta: poikilothermy + homeothermy. Poikilotherms: can"t to generate heat on their own. Ectotherms: their body heat is derived only from their external. Feed less and more likely to be able to live in resource poor enviornments. Use behavioral thermoregulations = sustained avg body temp that"s optimal for imp metabolic activities. 1) shuffling b/w areas with lower and high temps. 2) changing body positions to adjust heat exchange thru conduction. Use it periodically: actively thermoreg in day and passively conform in night. Sidewinder rattlesnakes: ball groups where core temp is stable while outside temp of. Hormone melatonin: implicated by temp regulation in many ectotherms.
