BIOB34H3 Chapter Notes - Chapter 10: Aestivation, Cellular Respiration, Homeothermy
Document Summary
Blood being carried to the brain via arteries is cooled by countercurrent exchange when it comes into contact with veins coming from the nose that have been cooled. If all else fails, animals will use active evaporative cooling, but they must have replacement water readily available. Evaporative cooling is done through: sweating: sweat (water with some na and cl) evaporates off the skin, carrying heat along with it, panting: increased breathing rate allows water evaporates from the warm, moist membranes of the respiratory tract. Can result in lowering of blood ph when too much co2 gets out. requires muscle effort: gular fluttering: birds open their beaks and vibrate the floor of their mouths. Evaporation occur because flow of air over the oral membrane increases. Mammals and birds acclimatize to winter and summer using 1 of 3 chronic responses: acclimatization of peak metabolic rate. Increases max rate at which is can produce heat strictly through aerobic metabolism.
