ExPhys Ch 14: Exercise in Hot and Cold Environments

What is the role of blood in heat transfer within the body?

• To store heat

• To move heat from the body core to the shell

• To dissipate heat through radiation

• To absorb heat from the environment

What is one of the methods of heat gain?

• Radiation

• Conduction

• Metabolic heat

• Evaporation

In the heat balance equation, what does it mean if M - W ± R ± C ± K - E > 0?

• Heat gain

• Heat loss

• Heat balance

• No change

What factor affects the evaporation (E) in the context of body temperature regulation?

• Water vapor pressure (humidity)

• Air pressure

• Skin temperature

• Body mass

What is a consequence of prolonged evaporation via sweat?

• Increased energy

• Dehydration

• Improved circulation

• Enhanced muscle growth

What must the body depend on if air temperature is greater than or equal to skin temperature?

• Conduction

• Evaporation

• Radiation

• Convection

What does POAH stand for in the context of thermoregulatory function?

• Preoptic Anterior Hypothalamus

• Postoperative Anterior Hypothalamus

• Preoperative Anterior Hypothalamus

• Postoptic Anterior Hypothalamus

What happens to the sweat glands during heat stress?

• They become inactive

• They decrease evaporative heat loss

• They become active, increasing evaporative heat loss

• They reduce blood flow

Which part of the brain senses decreased blood temperature?

• Cerebellum

• Hypothalamus

• Medulla oblongata

• Thalamus

What occurs in skin blood vessels to reduce heat loss?

• Vasodilation

• Vasoconstriction

• Increased blood flow

• Decreased blood flow