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Multiple Choice



1

If heat loss is less than heat production there will be
A)a gain in body temperature.
B)a loss of body temperature.
C)no change in body temperature.
D)an initial loss then a gain in body temperature.
2

During exercise, body temperature is regulated by making adjustments in
A)the amount of heat produced.
B)the resting metabolic rate.
C)the amount of heat lost.
D)biochemical heat production.
3

The temperature control center is in an area of the brain called the
A)medulla.
B)pons.
C)pituitary.
D)hypothalamus.
4

The amount of energy expended during exercise that appears as heat is approximately
A)20 to 25%.
B)40 to 45%.
C)55 to 60%.
D)75 to 80%.
5

Hormones released from the thyroid gland that is/are responsible for increasing the metabolic rate is/are
A)epinephrine.
B)thyroxine.
C)norepinephrine.
D)both a and c.
6

Radiative heat loss involves
A)heat transfer to air molecules.
B)heat transfer to water molecules.
C)infrared rays.
D)none of the above.
7

Evaporation accounts for approximately ______________ of the heat loss at rest.
A)25%
B)10%
C)75%
D)90%
8

The least amount of evaporative cooling occurs on a
A)hot/low humidity day.
B)hot/high humidity day.
C)cold/low humidity day.
D)cold/high humidity day.
9

When air temperature is greater than skin temperature, the only means of losing body heat during exercise is via
A)radiation.
B)conduction.
C)convection.
D)evaporation.
10

The vasomotor control center is responsible for
A)the sweating response.
B)the detection of skin temperature.
C)the baroreceptor reflex.
D)promoting increased skin blood flow.
11

The rise in core temperature during exercise is most influenced by
A)environmental temperature.
B)relative humidity.
C)exercise intensity.
D)resting metabolic rate.
12

As the ambient temperature increases, the rate of convective and radiative heat loss
A)decreases.
B)increases.
C)does not change.
D)increases then decreases.
13

Heat acclimatization results in a ____________ increase in plasma volume
A)10 to 12%
B)4 to 6%
C)20 to 22%
D)30 to 32%
14

Heat acclimatization is almost complete after
A)3 to 7 days.
B)7 to 14 days.
C)3 to 4 weeks.
D)1 to 2 months.
15

Cold acclimatization results in
A)decrease in nonshivering thermogenesis.
B)decreased peripheral circulation.
C)improved ability to sleep in the cold.
D)all of the above.
16

Exercise in a cold environment
A)reduces an athlete's ability to lose heat.
B)enhances an athlete's ability to lose heat.
C)increases the chance of heat injury.
D)does both a and c.
17

During prolonged exercise in a moderate environment
A)core temperature will increase gradually.
B)core temperature will decrease gradually.
C)core temperature will remain unchanged.
D)core temperature will decrease then increase.
18

The organ(s) that is/are responsible for reacting to increases in core temperature is/are
A)the posterior hypothalamus.
B)the thyroid gland.
C)the anterior hypothalamus.
D)both b and c are
E)correct.
19

Actions that are aimed at increasing heat loss are
A)earlier commencement of sweating.
B)increase in skin blood flow.
C)cutaneous vasoconstriction.
D)both a and b.
20

During 25 minutes of submaximal exercise in a cool environment, which mechanism plays the least important role in heat loss?
A)radiation
B)conduction
C)convection
D)evaporation





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