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Ex Phys Ch. 12

Terms in this set (18)

Hypothermia is defined as a significant
Decrease and body core temperature
Heat production can be increased through
Shivering, nonshivering thermogenesis, the action of thyroxine and catecholamines
Heat Acclimatization occurs generally within
7 to 14 days
Exercise in the heat is associated with accelerated fatigue due, in part, to
Increased free radical production any active skeletal muscles
The primary source of heat production during exercise is
The contracting skeletal muscles
The bodies thermostat is located in the
Hypothalamus
Compared to exercise in a cool environment, prolonged exercise in the heat
Results in a more rapid onset of muscular fatigue
Cold acclamation result in which of the following physiological adaptations?
Increased nonshivering thermogenesis, improved ability to prevent a large decreases and skin temperature during cold exposure, improved ability to sleep in cold environments
An increase in body core temperature results in
Cutaneous vasodilation
The primary adaptations that occur during heat acclimatization are
And increased plasma volume, earlier onset of sweating, and a higher sweat rate
During exercise _____ of energy produced is released as heat
70-80%
At high environmental temperatures, which of the following variables impact the amount of heat loss by evaporation?
Convective currents, ambient temperature and relative humidity, amount of exposed skin
Which of the following statements about body temperature homeostasis is correct?
Body temperature is a balance between heat loss in heat game
The higher the relative humidity, the _____ paper pressure gradient between the skin and the environment
Lower
The principal means of heat loss at rest and a cool indoor environment (20 degrees C/low humidity) is via
Radiation
What are heat shock proteins?
Repeated bouts of exercise in a warm or hot environments increase their synthesis in cells, they stabilize and refold damaged cellular proteins, they assist cells and tolerating heat stress
Why is regulation of body core temperature important?
Because cellular structures of metabolic pathways are affected by temperature, low temperatures can promote abnormal cardiac function, high temperatures can alter the structure and function of enzymes
Evaporation of 1 L of sweat would result in the loss of ______ kcal of heat
580
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