1 / 7

Thermoregulation

Thermoregulation. Ectotherms Obtain body heat from their environment Poikilotherms (changing temperature) Most invertebrates, amphibians, reptiles, and fish “Cold-blooded”. Thermoregulation. Endotherms Generate their own body heat Homeotherms maintain a constant internal temperature

kaori
Download Presentation

Thermoregulation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Thermoregulation • Ectotherms • Obtain body heat from their environment • Poikilotherms (changing temperature) • Most invertebrates, amphibians, reptiles, and fish • “Cold-blooded”

  2. Thermoregulation • Endotherms • Generate their own body heat • Homeotherms • maintain a constant internal temperature • “Warm-blooded”

  3. Mechanisms of Thermoregulation • Cooling by evaporation • Lose heat by sweating • Phase change requires energy (endergonic) • Body heat is removed when water vaporizes • Evaporative heat lose occurs from the respiratory tract • Panting

  4. Mechanisms of Thermoregulation • Warming by metabolism • Muscle contraction • Metabolic activities generate heat • Example • Shivering warms animals

  5. Mechanisms of Thermoregulation • Adjusting surface area to regulate temperature • Extremities add surface area to the body • Arms, hands, feet, ears • By changing the volume of blood that flows to these areas by vasoconstriction or vasodilation, heat can be conserved or lost.

  6. Mechanisms of Thermoregulation • Examples • Hot environments • Elephants and jack rabbits • Cold environments • Countercurrent exchange • Heat conduction form warm blood to the returning cold blood is redirected to internal parts of the body before reaching the extremity

  7. Mechanisms of Thermoregulation • Various behavioral, physiological, or anatomical adaptations • Hibernation • Hair • Feathers • Blubber • Moving into shady areas, out of the direct sunlight • Restrict activities to night

More Related