9433778
Description
Quiz by Med Student , updated more than 1 year ago
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Created by Med Student
over 7 years ago
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Question 1
Question
Thermoreceptors are:
Answer
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activated only by severe cold or severe hot
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located on the superficial layers of the skin
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a subtype of nociceptors
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on dendritic endings of A6 fibres and C fibres
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all of the above
Question 2
Question
The most significant heat source in the body is:
Answer
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cellular respiration
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conductive heat loss
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convective heat loss
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evaporation
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shivering
Question 3
Question
A major means for conserving heat is:
Answer
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vasodilatation of coetaneous blood vessels
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increased metabolic rate
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vasoconstriction of coetaneous blood vessels
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enhanced sweating
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increased convective loss
Question 4
Question
The thermoregulatory center is located in:
Answer
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cortex
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vascular system
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septal region
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amygdale
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hypothalamus
Question 5
Question
What is the normal body temperature?
Answer
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81.1°C
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36.9°C
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98.6°C
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21.7°C
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39.5°C
Question 6
Question
At which temperature does the excitation of the thermoreceptors begin to cause pain?
Answer
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at the temperature which causes tissue damage
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over 45°C
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at 30°C
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at 5°C
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b, and d
Question 7
Question
Heat stroke is characteristically associated with:
Answer
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profuse sweating
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elevated basal metabolic rate
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hot dry skin
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a and b
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b and c
Question 8
Question
As ambient temperature increases, heat loss increases by:
Answer
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radiation
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convection
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conduction
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evaporation
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none of the above
Question 9
Question
Which of the following is not a function of skin?
Answer
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respiration
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excretion
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sensation
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thermoregulation
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protection
Question 10
Question
Following adaptation to a hot climate there is an increase in:
Answer
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basal metabolic rate
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heat loss by radiation and convection
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urinary output
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the ability to lose heat by sweating
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decreasing arteriovenous shunting of blood to venous plexus near the surface of the skin
Question 11
Question
Heat - loss mechanisms:
Answer
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by radiation and convection increase when the ambient temperature decreases
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by evaporation; depend on the activity of sweat glands being under sympathetic muscarinic control
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are controlled by the anterior hypothalamus
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cause an increase in sympathetic tone to skin blood vessels
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decrease arteriovenous shunting of blood to venous plexus near the surface of the skin
Question 12
Question
The set-point temperature of the hypothalamus, triggering heat - loss or heat - generating mechanisms is:
Answer
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34° C
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37° C
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20° C
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36.3° C
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30° C
Question 13
Question
When the temperature of environment is above 34°C, the only heat-loss mechanism is:
Answer
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convection
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radiation
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shivering
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evaporation
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radiation and convection
Question 14
Question
The set point level for body temperature is situated in:
Answer
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anterior hypothalamus
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skin
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spinal cord
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posterior hypothalamus
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brown mast tissue
Question 15
Question
The most potent mechanism for increasing heat production is:
Answer
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activation of the parasympathetic nervous system
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thyroid hormone increasing the metabolic rate
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shivering
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radiation
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decrease in sympathetic tone to skin blood vessels
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