HSC 2100 Lecture Notes - Lecture 38: Macrotis, Evaporative Cooler, Vasoconstriction
Document Summary
Includes those who possess a skull or cranium and a segmented spinal column. Vasoconstriction prevents heat loss from blood vessels to the the skin. Increased metabolic activity (eg, shivering of the muscles to produce heat) Counter current exchange (used by arctic birds to heat cool blood vessels from the extremities by placing near warm blood vessels from the heart) Sun baking to absorb heat onto skin and warm blood vessels. Uncurl tail to exposed greater surface area to sunlight. Vasodilation encourages loss of heat from blood vessels to the skin. Evaporative cooling (eg, sweating, panting or licking of paws as seen in the australian red kangaroo) Migration and aestivation (eg, movement of australian bogon moths to australian alps in summer to aestivate in cool caves) Nocturnal activity (eg, bandicoot or "bilby" is nocturnal) Stomata in plants open and allow evaporative cooling. Plants can alter turger pressure as petals change orientation, reducing exposure to the sun.
