Feedback mechanisms that correct deviations from a set point, bringing the system back closer to the set point o Body temperature regulation - Positive Feedback o Mechanism that maintain a metabolic/function o The action of the effector Is to reinforce rather than reverse
o Occurs less frequently than negative feedback o Childbirth - Regulates Body Temperature o Temperature affects the rate of chemical reactions o Every 10 degree increase in temperature doubles the rate o Enzyme structure is affected by high temperatures Temperature Regulation- Methods of Heat Transfer - Radiation - Conduction - Convection - Evaporation Temperature Regulation - Animals are classified based on how body heat is generated o Endotherms: Birds and mammals o Ectotherms: External sources of body heat, little insulation (Fish, Reptiles) o Homeotherm: Maintains stable temperature o Behavior to regulate temperature Shade/sun Orientation to sun Stilting Nocturnal, diurnal or crepuscular Relationship between body mass and metabolic rate in mammals - Smaller animals have higher metabolic rates and consume more energy per unit of body mass than larger animals - Small animals have a higher surface area to volume ratio - Heat is retained in body mass, smaller animals lose heat quickly In Class Body Hierarchy - Organs have a combination of all four tissue types o Epithelium, Connective, Muscle, Nervous - Zygote: Totipotent - Blastula: Pluripotent - Gastrula: Multipotent
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- Fall '19
- o Temperature