Temperature Regulation
(117).jpg "Temperature Regulation")
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- 1.The heat transfer mechanism that occurs between the sun and the outer layer of the skin is called what?
- A.
Conduction
- B.
Convection
- C.
Radiation
- D.
Evaporation
- 2.The heat transfer mechanism that occurs between arteries and veins in a countercurrent exchange is called what?
- A.
Conduction
- B.
Convection
- C.
Radiation
- D.
Evaporation
- 3.What is the major heat source to retain body temperature for a nude 65-kg adult person in a 29oC/84.2oF environment?
- A.
Brain
- B.
Brown adipose tissue
- C.
Liver
- D.
Skeletal muscle
- E.
White adipose tissue
- 4.Which of the following is a human thermoregulatory response controlled by cholinergic sympathetics?
- A.
Brown adipose tissue thermogenesis
- B.
Hand vasomotion
- C.
Shivering thermogenesis
- D.
Sweat secretion
- E.
Thermoregulatory behavior
- 5.Which of the following will most faithfully reflect changes in human core temperature that could be caused by immersion in a warm body bath?
- A.
Oral temperature
- B.
Rectal temperature
- C.
Axillary temperature
- D.
Tympanic temperature
- E.
Esophageal temperature at the cardia
- 6.In a man passively warmed such that his mean skin temperature reaches 40.5oC/104.9oF, which of the following circulatory responses will occur?
- A.
Increased cardiac output, decreased splanchnic blood flow
- B.
Increased cardiac output, increased muscle blood flow
- C.
Unchanged cardiac output, decreased right atrial pressure
- D.
Unchanged cardiac output, decreased renal blood flow
- 7.Which of the following is true at the beginning of the rising phase of fever?
- A.
Sweat secretion is stimulated
- B.
Mean skin temperature is below normal
- C.
Muscle blood flow is decreased
- D.
Behavioral thermoregulatory responses are inhibited
- E.
Warm-sensitive neurons in the integration center are excited
- 8.The principal physical mechanism that accounts for the transfer of heat within the body is what?
- A.
Conduction
- B.
Convection
- C.
Radiation
- D.
Evaporation
- 9.When the environmental temperature increases moderately, what happens to blood flow to the skin?
- A.
It decreases to stop the transport of heat from the skin surface to deeper tissues
- B.
It decreases because the local thermoreceptors in the skin sense an increase in body temperature
- C.
It increases because the sweat glands release vasodilators
- D.
It increases as part of the body temperature regulatory mechanisms
- E.
It increases as the metabolic needs of the skin tissue increase
- 10.If someone is experiencing heat exhaustion. Which of the following would definitively indicate that they are now at risk for heat stroke?
- A.
Increased sympathetic dilation of their blood vessels
- B.
Increased hypotension
- C.
Their skin becomes very dry
- D.
They suddenly faint
- E.
They have an increased volume of sweat production
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