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Life Sciences - Animal Sciences | Temperature Regulation in Humans and Other Mammals

Temperature Regulation in Humans and Other Mammals

Jessen, Claus

Softcover reprint of the original 1st ed. 2001, X, 194 p.

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  • About this textbook

  • Excellent introduction into the physiology of temperature regulation in mammals.
How do mammals manage to maintain their body temperature within the same narrow range in environments as different as polar regions and hot deserts? This advanced text describes the morphological features and physiological mechanisms by which humans and other mammals maintain their body temperature within a narrow range despite large variations in climatic conditions and internal heat production. Its 19 chapters deal with the physics of heat exchange with the environment, and the autonomic and behavioural mechanisms available to control the loss and production of heat. The neuronal basis of temperature regulation and current concepts of the central nervous interface between temperature signals generated in the body and control mechanisms are examined in detail. This book is of invaluable help for undergraduates, postgraduates, teachers, physicians and scientists.

Content Level » Graduate

Keywords » Homothermie - Physiologie - Sportmedizin - Temperature regulation - Temperaturregulation - Thermoregulation - Wärmeaustausch - heat exchange - homeothermy - pathophysiology - physiology - sports medicine - thermoregulatioon - tissue

Related subjects » Animal Sciences - Biochemistry & Biophysics - Human Physiology - Medicine

Table of contents 

1 Introduction.- 1.1 Poikilotherms and Homeotherms.- 1.2 The Capacity of the System.- 1.3 Homeothermy in Terms of Control Theory.- 1.4 A First Approach to the Controller.- 2 The Skin as a Source of Temperature Signals.- 3 The Inner Body as a Source of Temperature Signals.- 3.1 Identifying Single Feedback Loops.- 3.2 Hypothalamus.- 3.3 Spinal Cord.- 3.4 Other Thermosensitive Sites of the Body Core.- 4 The Neuronal Basis of Temperature Reception.- 4.1 Skin Thermoreceptors.- 4.1.1 Afferent Processing of Skin Temperature Signals.- 4.2 Core Temperature Sensors Outside the Central Nervous System.- 4.3 Thermosensitive Neurons in the Central Nervous System.- 4.3.1 Neuronal Temperature Transduction.- 4.3.2 Sensitivity to Local and Remote Temperatures.- 5 Heat Production and Heat Balance of the Body.- 5.1 The Heat Balance Equation.- 5.2 Body Mass, Heat Exchange and Metabolic Rate.- 5.3 Metabolic Heat Production vs. Metabolic Rate.- 5.4 Basal Heat Production vs. Resting Heat Production.- 5.5 Shivering.- 5.6 Non-Shivering Thermogenesis in Brown Adipose Tissue.- 5.7 Cold-Induced Non-Shivering Thermogenesis in Other Tissues.- 6 Physics of Heat Exchange with the Environment.- 6.1 Conduction.- 6.2 Convection.- 6.2.1 Natural Convection.- 6.2.2 Forced Convection.- 6.2.3 The Heat-Transferring Medium.- 6.3 Radiation.- 6.3.1 Long-Wave Infrared.- 6.3.2 Solar Radiation.- 6.4 Evaporation.- 6.4.1 Sweating.- 6.4.2 Panting.- 7 External and Internal Insulation.- 7.1 External Insulation: Fur.- 7.1.1 Fur and Solar Radiation.- 7.1.2 Fur and Exercise.- 7.2 Internal Insulation: Fat and the Principle of Core and Shell.- 7.2.1 Core Temperature vs. Mean Body Temperature.- 7.2.2 Internal Conductance.- 7.3 Total Conductance.- 8 The Temperature Field of the Body Core.- 8.1 Passive Temperature Deviations.- 8.1.1 Where to Measure a “Representative” Body Core Temperature.- 8.2 Regulated Temperature Deviations.- 8.2.1 Selective Brain Cooling.- 8.2.2 Testes Cooling.- 9 Behavioural Control of Heat Exchange with the Environment.- 9.1 Locomotion.- 9.2 Orientation and Posture.- 9.3 Wallowing and Saliva Spreading.- 9.4 Social Behaviour.- 9.5 Operant Behaviour.- 10 Autonomic Control of Dry Heat Loss from the Skin.- 10.1 Pilomotion.- 10.2 Peripheral Blood Flow.- 10.2.1 Skin Blood Flow and Skin Temperature.- 10.2.2 Anatomy of Peripheral Circulation.- 10.2.3 The Central Drive.- 10.2.4 Local Effects of Skin Temperature.- 10.2.5 Specialized Surface Regions.- 11 Autonomic Control of Evaporative Heat Loss.- 11.1 Sweating.- 11.1.1 Types of Sweat Glands and Modes of Transmission.- 11.1.2 Sweat Rate: Central Drive and Local Effects.- 11.2 Panting.- 11.3 Sweating vs. Panting.- 12 Interaction of Various Body Temperatures in Control of Thermoregulatory Responses.- 12.1 Core Temperature as a Compound Input.- 12.1.1 Selective Brain Cooling: a Special Pattern of Core Temperatures.- 12.1.2 Natural Spinal Cord Warming.- 12.2 Skin and Core Temperatures.- 12.2.1 Autonomic Effector Mechanisms.- 12.2.2 Behavioural Responses.- 12.3 The Regulated Variable.- 13 The Central Interface Between Afferent Temperature Signals and Efferent Drives.- 13.1 The Controller: Concepts and Facts.- 13.2. Neuronal Models.- 13.3 The Set-Point Problem.- 14 Short-Term Temperature Regulation in Various Environments: Inputs and Responses.- 14.1 The Medium Range.- 14.1.1 The Thermoneutral Zone.- 14.2 Short-Term Exposure to Cold.- 14.3 Short-Term Exposure to Heat.- 15 Exercise in the Heat: the Ultimate Challenge.- 15.1 Cardiovascular System.- 15.2 Body Fluid Balance.- 16 Changes of Set-Point.- 16.1 Ovarian Cycle and Circadian Rhythm, But Not Sleep.- 16.2 Fever.- 16.2.1 Pyrogens and Fever.- 17 Adaptation to Cold.- 17.1 Smaller Animals.- 17.1.1 Hibernation.- 17.1.2 Daily Torpor.- 17.1.3 Everybody Starts Small.- 17.2 Larger Animals.- 17.3 Humans.- 18 Adaptation to Heat.- 18.1 Smaller Animals.- 18.2 Larger Animals.- 18.3 Humans.- 19 Pathophysiology of Temperature Regulation.- 19.1 Hyperthermia and Heat Stroke.- 19.2 Hypothermia.- References.

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