Exam+2+--+Winter+2008+--+Blank-1

Exam+2+--+Winter+2008+--+Blank-1 - B l o2 2 5 f'.aara- l...

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Blo 225 f'.aara- l4e4-r"-.,t (nre."^) Exarn 2 Sample Exarn Ouestions 2/19/08 I. Countercurrenl heat exchange in the leg of a goose shnding in cold waler will help maintain an elevated core body temperature because: a) the cold water surrounding the goose's constricts blood vessels rcsulting in reduced flow of blood to the leg. b) the goose warms its leg by placing it under its wing. c) the goose stretches ifs neck to be parallel to its leg. d) heat will be transferred from cold venous blood eniering the leg to warm arterial blood leaving the leg. e) heat will be transfered from warm arterial blood entering the leg to cold venous blood leaving fhe leg. 2. When an endotherm is losing heat it must produce enough to match the amount lost. When gaining heat, it must dissipate the same amount gained. Choose the correct statement from the following: a) Endotherms can regulate heal flux by increasing metabolic heat production when lhe ambient temperature drops below the lower limi! of their thermoneutral zone b) Endotherms regulate heat flux by incfeasing evaporative heat loss when the ambienl temperature rises above the upper limit of their lhefmoneutral zone. c) Endothems control heat flux by allering their behavior. d) All of the above. e) a and b. 3. Some large pelagic fishes such as the tuna have a vascular structure called the rete mirable. The rete mirable is a countercunent beal exchanger that serves tol a) maintain elevated core body lemperature through the direct dissipation ofheat lrom the arterial blood to the surrounding muscle. b) maintain elevated core body tenrperature through the indirect transfer ofheat from the venous to the aterial blood. c) maintain elevated core body temperature through the direct ransfer of heat from tbe anerial to the venous blood. (Heat transfer is direct since the blood vessels that carry blood traveling in different directions are in direct conlacl with each othe.). d) maintain elevated core body temperature through the direct
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Exam+2+--+Winter+2008+--+Blank-1 - B l o2 2 5 f'.aara- l...

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