Question

Exercising in a hot chamber may induce 

A. Fainting due to a decreased total peripheral resistance. 

B. Heat stroke when core temperature rises above 40^o C. 

C. A rise in alveolar P_CO2. 

D. A decrease in the osmolality of extracellular fluid. 

E. Heat adaptation if performed daily for several weeks.

Answer 1

A. True Vasodilation in skin in addition to that in muscle may reduce arterial pressure to fainting point. 

B. True There is a serious risk of a progressive rise to fatal levels due to positive feedback. 

C. False It falls due to the hyperventilation induced by the rise in core temperature. 

D. False Osmolality rises due to the high output of hypotonic sweat. 

E. True By improving the efficiency of heat losing mechanisms, heat adaptation allows the subject to have a smaller rise in core temperature for a given workload.