Which of the following mechanisms help to maintain body temperature on hot days?
a. decreased muscle tone
b. skin vasodilation
c. sweating
d. two of these answers.
e. all of these answers.
(
Question 2) Vasoconstriction of the blood vessels to the skin
a. is coordinated by the sympathetic nervous system.
b. lowers heat exchange with the environment.
c. occurs when core body temperature is elevated.
d. both (a) and (b) above
e. all of these answers.
(
Question 3) When vasodilation of the blood vessels in the skin occurs,
a. the skin temperature becomes warmer than the core temperature.
b. the insulative capacity of the skin is increased.
c. heat will be lost from the body if the air temperature is cooler than the skin temperature.
d. both (b) and (c) above.
e. all of these answers.
(
Question 4) Select the means of heat energy emission from the surface of a warm body.
a. radiation
b. conduction/convection
c. evaporation
d. both (b) and (c) above.
e. all of these answers
(
Question 5) The temperature control center within the anterior region of the hypothalamus is activated by ____ and initiates reflexes that mediate ____.
a. cold, heat production and heat conservation.
b. cold, heat loss.
c. warmth, heat loss.
d. warmth, heat production and heat conservation.
e. warmth, vasoconstriction.
(
Question 6) Nonshivering thermogenesis
a. is stimulated by epinephrine and thyroid hormone.
b. refers to the general increase in muscle tone in response to abrupt exposure to cold.
c. enhances the insulative capacity of the skin by promoting increased deposition of brown fat under the skin.
d. refers to the elevation of body temperature in response to pyrogen release.
e. none of these answers.
(
Question 7) The major means of decreasing heat loss in response to a cold environmental temperature is
a. skin vasoconstriction.
b. skin vasodilation.
c. increasing the temperature gradient between the skin and environment.
d. formation of goose bumps.
e. shivering.
(
Question 8) Each of the following is a means of generating or holding heat in the body except
a. diminished sweating.
b. exercising.
c. shivering.
d. vasodilation of blood vessels in the skin.
e. behavioral adaptations.
(
Question 9) The major means of increasing heat production in response to a cold environmental temperature is
a. skin vasoconstriction.
b. wearing warm clothing.
c. increased muscle activity, such as through shivering and increased voluntary exercise.
d. formation of goose bumps.
e. increased food intake.
(
Question 10) Skin temperatures may fluctuate between ___F and ____ F without damage
a. 40-98.6
b. 68-104
c. 0-98.6
d. 0-110
e. none of the above
Quick Reply
