Thermoregulation - Anatomy & Physiology - Revision history

Bara at 13:23, 29 June 2012

2012-06-29T13:23:50Z

Bara at 18:41, 7 January 2011

2011-01-07T18:41:13Z

Aimee.e.hicks: /* Links */

2011-01-04T11:52:07Z

Links

Aimee.e.hicks at 11:51, 4 January 2011

2011-01-04T11:51:41Z

Bara at 18:18, 2 January 2011

2011-01-02T18:18:35Z

Bara at 15:14, 13 September 2010

2010-09-13T15:14:20Z

Bara at 13:32, 31 August 2010

2010-08-31T13:32:44Z

A.allison at 16:29, 3 September 2008

2008-09-03T16:29:12Z

A.allison at 16:28, 3 September 2008

2008-09-03T16:28:39Z

Lwyacem at 09:09, 15 August 2008

2008-08-15T09:09:54Z

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 ==Overview==
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 [[Category:Endocrine System - Anatomy & Physiology]]
 [[Category:A&P Done]]

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 '''Homeotherm/Endotherm''': An organism with an internal temperature which remains relatively constant despite external temperature fluctuations.
-'''Poikilotherm/Ectotherm''': An organism having a body temperature which fluctuates with the external environment - eg Fish, Reptile.
+'''Poikilotherm/Ectotherm''': An organism having a body temperature which fluctuates with the external environment - eg. fish, reptile.
 ==Mechanism of Action==
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 . '''Integrating Centre:''' The [[Hypothalamus - Anatomy & Physiology|hypothalamus]] is the control centre in the brain which compares the temperature information with an ''internal reference'' or ''set point''.
-. '''Motor Component''': Neurons which send signals to alter the internal temperature, altering heat production or heat loss. These command signals may travel via the somatic motor system and affect heat production in skeletal muscle or they may travel via the sympathetic nerve fibres and change; Blood Flow to the Skin, sweat gland activity or activity of the smooth muscles which regulate fur/plumage thickness.
+. '''Motor Component''': Neurons which send signals to alter the internal temperature, altering heat production or heat loss. These command signals may travel via the somatic motor system and affect heat production in skeletal muscle or they may travel via the sympathetic nerve fibres and change blood flow to the skin, sweat gland activity or activity of the smooth muscles which regulate fur/plumage thickness.
 ==Adaptation to Heat==
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 ==Adaptation to Cold==
-Sweating stops, the cutaneous arteries constrict causing, ''Vasoconstriction''. This minimises heat loss from the blood to the body surface. The [[Hair - Anatomy & Physiology|hairs]] on the skin are raised involuntarily by the ''arrector pili'' muscles attached to each hair follicle. This layer acts as an insulator, trapping heat. Heat production can be increased by shivering, caused by messages from the brain to muscles. This causes increased heat production as the muscle cells respire. Respiration can also be increased, as respiration is an exothermic reaction.
+Sweating stops, the cutaneous arteries constrict (''vasoconstriction''). This minimises heat loss from the blood to the body surface. The [[Hair - Anatomy & Physiology|hairs]] on the skin are raised involuntarily by the ''arrector pili'' muscles attached to each hair follicle. This layer acts as an insulator, trapping heat. Heat production can be increased by shivering, caused by messages from the brain to muscles. This causes increased heat production as the muscle cells respire. Respiration can also be increased, as respiration is an exothermic reaction.
 ==Specialised Temperature Regulation==
-Some animals can maintain their body temperature by behavioural adjustments, e.g. Lizards bask in the sun during the day, and when they overheat they hide under rocks to allow their body temperature to fall. Some animals living in particularly cold areas are ''regionally heterothermic'', and are able to allow their less insulated extremities to cool to temperatures much lower than their core temperatures, minimising heat loss through exposed body parts such as hooves, legs, feet, nose. Hibernation occurs in some species in order to allow survival during times of limited food resources and low temperatures. Estivation occurs in the summer, allowing some animals to survive periods of high temperature and minimal water (eg turtles burrow into pond mud). Daily Torpor occurs in small endotherms, e.g. bats and hummingbirds, who temporarily reduce their high metabolic rates in order to conserve energy.
+Some animals can maintain their body temperature by behavioural adjustments, e.g. lizards bask in the sun during the day, and when they overheat they hide under rocks to allow their body temperature to fall. Some animals living in particularly cold areas are ''regionally heterothermic'', and are able to allow their less insulated extremities to cool to temperatures much lower than their core temperatures, minimising heat loss through exposed body parts such as hooves, legs, feet, nose. Hibernation occurs in some species in order to allow survival during times of limited food resources and low temperatures. Estivation occurs in the summer, allowing some animals to survive periods of high temperature and minimal water (eg. turtles burrow into pond mud). Daily torpor occurs in small endotherms, e.g. bats and hummingbirds, who temporarily reduce their high metabolic rates in order to conserve energy.
 ==Links==
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 [[Category:Endocrine System - Anatomy & Physiology]]
-[[Category:To Do - AimeeHicks]][[Category:To Do - Review]]
+[[Category:A&P Done]]

← Older revision		Revision as of 11:52, 4 January 2011
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	[[Category:Endocrine System - Anatomy & Physiology]]		[[Category:Endocrine System - Anatomy & Physiology]]
−	[[Category:To Do - AimeeHicks]]	+	[[Category:To Do - AimeeHicks]][[Category:To Do - Review]]

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-==Thermoregulation==
+==Overview==
-*'''Homeotherm/Endotherm''': an organism with an internal temperature which remains relatively constant despite external temperature fluctuations.
+Thermoregulation is the ability of an endothermic organism to maintain a relatively constant body temperature, despite fluctuations in temperature of the external environment. This is a vital part of homeostasis.
-*'''Poikilotherm/Ectotherm''': an organism having a body temperature which fluctuates with the external environment - eg Fish, Reptile.
 ==Mechanism of Action==
 The thermoregulatory mechanism consists of:
 ==Adaptation to Heat==
-*Sweating - causes heat loss via evaporation.
-*Reduction of the resistance of cutaneous arterioles = ''Vasodilation''. This allows more heat from the circulation to be transferred to the air.
+Sweating causes heat loss via evaporation. ''Vasodilation'' is the reduction of the resistance of cutaneous arterioles. This allows more heat from the circulation to be transferred to the air. [[Hair - Anatomy & Physiology|Hairs]] on the skin can also lie flat. The ''arrector pili'' muscle attached to the proximal end of each hair follicle, relaxes to minimise heat being trapped by the hairs.
 ==Adaptation to Cold==
-*Sweating Stops
-*Cutaneous arteries constrict - ''Vasoconstriction''. This minimises heat loss from the blood to the body surface.
+Sweating stops, the cutaneous arteries constrict causing, ''Vasoconstriction''. This minimises heat loss from the blood to the body surface. The [[Hair - Anatomy & Physiology|hairs]] on the skin are raised involuntarily by the ''arrector pili'' muscles attached to each hair follicle. This layer acts as an insulator, trapping heat. Heat production can be increased by shivering, caused by messages from the brain to muscles. This causes increased heat production as the muscle cells respire. Respiration can also be increased, as respiration is an exothermic reaction.
 ==Specialised Temperature Regulation==
-*Some animals can maintain their body temperature by behavioural adjustments:
-eg Lizards bask in the sun during the day, and when they overheat they hide under rocks to allow their body temperature to fall.
+Some animals can maintain their body temperature by behavioural adjustments, e.g. Lizards bask in the sun during the day, and when they overheat they hide under rocks to allow their body temperature to fall. Some animals living in particularly cold areas are ''regionally heterothermic'', and are able to allow their less insulated extremities to cool to temperatures much lower than their core temperatures, minimising heat loss through exposed body parts such as hooves, legs, feet, nose. Hibernation occurs in some species in order to allow survival during times of limited food resources and low temperatures. Estivation occurs in the summer, allowing some animals to survive periods of high temperature and minimal water (eg turtles burrow into pond mud). Daily Torpor occurs in small endotherms, e.g. bats and hummingbirds, who temporarily reduce their high metabolic rates in order to conserve energy.
 ==Links==
@@ Line 43: / Line 34: @@
 [[Category:Endocrine System - Anatomy & Physiology]]
-[[Category:To Do - A&P]]
+[[Category:To Do - AimeeHicks]]

← Older revision		Revision as of 18:18, 2 January 2011
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	[[Category:Endocrine System - Anatomy & Physiology]]		[[Category:Endocrine System - Anatomy & Physiology]]
		+	[[Category:To Do - A&P]]

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 |linktext =Hypothalamus - Anatomy & Physiology
 |maplink = Endocrine System (Content Map) - Anatomy & Physiology
 }}
 <br>
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 ==Links==
 [[Thermoregulation in Skin - Anatomy & Physiology]]

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 |linkpage =Endocrine System - Anatomy & Physiology
 |linktext =Endocrine System
-|linkpage =Endocrine System - Hypothalamus - Anatomy & Physiology
+|linkpage =Hypothalamus - Anatomy & Physiology
 |linktext =Hypothalamus - Anatomy & Physiology
 |maplink = Endocrine System (Content Map) - Anatomy & Physiology

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 The thermoregulatory mechanism consists of:
 #'''Sensory Component''': neurones that possess nerve endings with thermoreceptors continuously monitor body temperature and transmit it to the integrating centre. These neurons may be within the skin or internal organs.
-#'''Integrating Centre:''' the [[Endocrine System - Hypothalamus - Anatomy & Physiology|Hypothalamus]] is the control centre in the brain which compares the temperature information with an ''Internal Reference'' or ''Set point''.
+#'''Integrating Centre:''' the [[Hypothalamus - Anatomy & Physiology|Hypothalamus]] is the control centre in the brain which compares the temperature information with an ''Internal Reference'' or ''Set point''.
 #'''Motor Component''': neurons which send signals to alter the internal temperature - altering heat production or heat loss.
 #*These command signals may travel via the somatic motor system and affect heat production in skeletal muscle.

← Older revision		Revision as of 09:09, 15 August 2008
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	*Estivation occurs in the summer, allowing some animals to survive periods of high temperature and minimal water (eg turtles burrow into pond mud).		*Estivation occurs in the summer, allowing some animals to survive periods of high temperature and minimal water (eg turtles burrow into pond mud).
	*Daily Torpor occurs in small endotherms eg bats and hummingbirds who temporarily reduce their high metabolic rates in order to conserve energy.		*Daily Torpor occurs in small endotherms eg bats and hummingbirds who temporarily reduce their high metabolic rates in order to conserve energy.
		+
		+	==Links==
		+	[[Thermoregulation in Skin - Anatomy & Physiology]]