Thermoregulation In Humans

41.9 Endotherms Use Behavior to Thermoregulate (a) Humans must put on many layers of insulating clothing to help their thermoregula-tory mechanisms keep pace with the extreme cold of western Siberia. (b) When air temperatures on the African savanna soar,an elephant may use a cool shower to thermoregulate.

(b) Loxodonta africana

(b) Loxodonta africana

41.9 Endotherms Use Behavior to Thermoregulate (a) Humans must put on many layers of insulating clothing to help their thermoregula-tory mechanisms keep pace with the extreme cold of western Siberia. (b) When air temperatures on the African savanna soar,an elephant may use a cool shower to thermoregulate.

Thermoregulators Elephants

place to alter the heat exchange between its internal and external environments.

Behavioral thermoregulation is not the exclusive domain of ectotherms (Figure 41.9). Most animals, including en-dotherms, select comfortable thermal environments whenever possible. They may change their posture, orient to the sun, move between sun and shade, and move between still air and moving air, as demonstrated by the lizard in our field experiment. Examples of more complex thermoregulatory behavior are nest construction and social behavior such as huddling. Humans select appropriate clothing and heat or cool their buildings.

Solar radiation

Solar radiation

Thermoregulation Elderly

Objects in the environment exchange radiation with each other and with the sky. Warmer objects lose heat to cooler objects.

Heat is lost by convection when a stream of air (wind) is below body surface temperature.

Objects in the environment exchange radiation with each other and with the sky. Warmer objects lose heat to cooler objects.

Heat is lost by convection when a stream of air (wind) is below body surface temperature.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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