Question 1

Transfer of heat via air circulation or fluid movement is called&#10;A) Evaporation&#10;B) Radiation&#10;C) Convection&#10;D) Conduction

Accepted Answer

Convection is the transfer of heat through the movement of fluids (liquids or gases), often resulting in a circular pattern where warmer less dense fluid rises and cooler, denser fluid sinks.

Question 2

Which of the following provides the major physiological defense against overheating caused by strenuous exercise?&#10;A) Evaporation&#10;B) Radiation&#10;C) Convection&#10;D) Conduction

Accepted Answer

Evaporation of sweat from the skin surface is the primary mechanism by which the body dissipates heat generated by strenuous exercise, helping to prevent overheating.

Question 3

When exercise intensity increases progressively, which of the following processes of heat dissipation has been shown to increase also in order to maintain a thermal balance?&#10;A) Evaporation&#10;B) Radiation&#10;C) Convection&#10;D) Conduction

Accepted Answer

Evaporation is the primary method the body uses to dissipate heat during high-intensity exercise. As exercise intensity increases, the body produces more sweat, which then evaporates from the skin surface, helping to cool the body down and maintain thermal balance. The other methods (radiation, convection, and conduction) are less effective at higher exercise intensities.

Question 4

Which of the following will affect the effectiveness of sweat evaporation?&#10;A) Environmental temperature&#10;B) Relative humidity&#10;C) Convective air current&#10;D) All of the above

Accepted Answer

All of the factors listed - environmental temperature, relative humidity, and convective air currents - significantly influence the effectiveness of sweat evaporation. Higher temperatures and lower humidity levels facilitate evaporation, while convective air currents help by moving the air around the body, thereby increasing the rate of evaporation.

Question 5

Of the following factors affecting heat gain, which one is linked to the process of gaining heat via solar radiation?&#10;A) BMR&#10;B) Muscular activity&#10;C) Hormone&#10;D) Environment

Accepted Answer

The environment is the factor linked to the process of gaining heat via solar radiation, as it encompasses external conditions including sunlight exposure which directly affects heat gain through solar radiation.

Question 6

Adding which of the following to an oral rehydration beverage will facilitate fluid replenishment or water retention?&#10;A) Calcium&#10;B) Sodium&#10;C) Oxygen&#10;D) Phosphorus

Accepted Answer

Sodium helps the body retain water and is a key component of oral rehydration solutions, facilitating fluid replenishment by enhancing water absorption in the intestines.

Question 7

Which of the following has lowest heat tolerance?&#10;A) An adult who is lean&#10;B) An adult who is obese&#10;C) An elderly person who is lean&#10;D) An elderly person who is obese

Accepted Answer

Elderly individuals, especially those who are obese, generally have a lower heat tolerance due to decreased thermoregulatory efficiency and potential underlying health conditions that can impair heat dissipation.

Question 8

Which of the following is true regarding thermoregulation and gender?&#10;A) Women tend to produce less sweat than men&#10;B) Women depend more on vasodilation for dissipating heat&#10;C) Both A and B are correct&#10;D) Neither A nor B is correct

Accepted Answer

Both statements A and B are correct regarding gender differences in thermoregulation. Women generally produce less sweat than men, which is a key factor in thermoregulation during physical activity or in hot environments. Additionally, women rely more on vasodilation, the widening of blood vessels, to dissipate excess heat. This difference in thermoregulatory strategies can influence how men and women respond to temperature changes and physical exertion.

Question 9

Which of the following terms is defined as the process where repeated heat stress initiates thermoregulatory adjustments that improve exercise capacity and cause less discomfort on subsequent heat exposure?

A) Overload
B) Acclimatization
C) Habituation
D) Specificity

Accepted Answer

Acclimatization refers to the physiological adjustments the body makes in response to repeated exposure to high temperatures. These adjustments improve an individual's ability to perform and feel comfortable in hot conditions.

Question 10

When exercising in heat, blood flow in which of the following besides muscle increases significantly in an effort to maintain a normal body temperature?&#10;A) Kidney&#10;B) Skin&#10;C) Brain&#10;D) Stomach

Accepted Answer

During exercise in heat, blood flow to the skin increases significantly to facilitate heat dissipation through sweating and radiation. This helps in maintaining normal body temperature by allowing the body to release excess heat.

Deck 13: Body Weight and Composition for Health and Performance