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Jackrabbit ears: surface temperatures and vascular responses

R W Hill, J H Veghte

    Science (New York, N.Y.)
    |October 22, 1976
    PubMed
    Summary
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    This study shows that ear pinnae blood flow changes with ambient temperature to regulate body heat. Blood flow is reduced in cool temperatures to minimize heat loss and increased in warmer temperatures to facilitate heat exchange.

    Area of Science:

    • Physiology
    • Thermoregulation
    • Comparative Biology

    Background:

    • The ear pinnae are crucial for thermoregulation in many animals.
    • Understanding blood flow regulation in the pinnae is key to explaining heat exchange mechanisms.

    Purpose of the Study:

    • To investigate the relationship between ambient temperature and blood flow in the ear pinnae.
    • To elucidate the physiological responses of ear pinnae vasculature to varying thermal conditions.

    Main Methods:

    • Observational study analyzing blood flow patterns in ear pinnae.
    • Correlation of blood flow with ambient and body temperatures.

    Main Results:

    • Blood flow to ear pinnae is reduced between 1.4 and 24 degrees C, minimizing heat loss.

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  • Vasodilation occurs between 1 and 9 degrees C below body temperature, promoting heat loss.
  • Circulation of cooler blood occurs when ambient temperature exceeds body temperature by 4-5 degrees C, facilitating heat influx.

    • Conclusions:

    • Ear pinnae blood flow is dynamically regulated by ambient temperature for effective thermoregulation.
    • These vascular responses in the pinnae are vital for maintaining thermal homeostasis in animals.