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Lecture 27

BIOL 3070 Lecture 27: Lecture 27 Animal Physiology 2 Thermoregulation

2 Pages
81 Views
Winter 2017

Department
Biology
Course Code
BIOL 3070
Professor
Dr.Paluzzi
Lecture
27

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Lecture 27:
Tb = body temperature
Ta= ambient temperature
Heterotherms:
1) temporal: periods of heat gain and loss change by a factor of time
2) regional: the control of heat gain and loss change by factor of regions (such as tissues in the
organism where we have tissues losing heat and some are always producing heat)
Endotherms:
o A) cold environment
o B) warm environment
TEMPORAL HETEROTHERM
Insects flying in cool environments need to warm up their thoracic muscles
Done by isometric contraction of the thorax antagonistic muscles that
gives of heat without doing work until they reach 30 degrees take off
Hibernation:
They drop their body temperature to the ambient temperature of
where the bears are hiding during the winter
Bears only drop their body temperature by 5 degrees below normal
Daily torpor:
Decreased physiological activity reduction of body temp and
metabolic rate
Regional heterotherm:
o Specific portions of the body temperature is elevated while the remaining portion is
kept at ambient temperature
o Done by specific vasculature
o RETE MIRABILE countercurrent
The main arteries are under the skin (peripheral) and it would infiltrate the core
of the body and would maintain a higher core temperature compared to
another animal where it has its arteries in the middle and infiltrates the
peripheral (more loss of energy)
Endotherms thermal regulation
o Heat input + heat production = heat loss
Regulation of heat:
Heat dissipation sweating
Metabolic heat production
Blood flow in skin
o Thermal neutral zone: no change in the metabolic rate
o Above upper critical temperature would lead to increase in heat dissipation can lead
to death if temp keeps on increasing
o Below lower critical temperature increase metabolic rate so heat can be produced
Thermal neutral zone:
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Description
Lecture 27: Tb = body temperature Ta= ambient temperature • Heterotherms: • 1) temporal: periods of heat gain and loss change by a factor of time • 2) regional: the control of heat gain and loss change by factor of regions (such as tissues in the organism where we have tissues losing heat and some are always producing heat) • Endotherms: o A) cold environment o B) warm environment • TEMPORAL HETEROTHERM ▪ Insects flying in cool environments need to warm up their thoracic muscles • Done by isometric contraction of the thorax antagonistic muscles that gives of heat without doing work until they reach 30 degrees  take off ▪ Hibernation: • They drop their body temperature to the ambient temperature of where the bears are hiding during the winter • Bears only drop their body temperature by 5 degrees below normal ▪ Daily torpor: • Decreased physiological activity  reduction of body temp and metabolic rate • Regional heterotherm: o Specific portions of the body temperature is elevated while the remaining portion is kept at ambient temperature o Done by specific vasculature o RETE MIRABILE countercurrent ▪ The main arteries are under the skin (peripheral) and it would infiltrate the core of the body and would maintain a higher core temperature compared to another animal where it has its arteries in the middle and infiltrates the peripheral (more loss of energy) • Endotherms thermal regulation o Heat input + heat production = heat loss ▪ Regulation of heat: • Heat dissipation  sweating • Metabolic heat production • Blood flow in skin o Thermal neutral zone: no change in the metabolic rate o Above upper critical temperature would lead to increase in heat dissipation 
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