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Regulation of Body Temperature- Physiology 2nd year- PMU

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Regulation of Body Temperature- Physiology 2nd year- PMU
Hussain Basheer
Quiz by Hussain Basheer, updated more than 1 year ago More Less
Med Student
Created by Med Student almost 7 years ago
Hussain Basheer
Copied by Hussain Basheer almost 4 years ago
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Resource summary

Question 1

Question
Thermoreceptors are:
Answer
  • activated only by severe cold or severe hot
  • located on the superficial layers of the skin
  • a subtype of nociceptors
  • on dendritic endings of A6 fibres and C fibres
  • all of the above

Question 2

Question
The most significant heat source in the body is:
Answer
  • cellular respiration
  • conductive heat loss
  • convective heat loss
  • evaporation
  • shivering

Question 3

Question
A major means for conserving heat is:
Answer
  • vasodilatation of coetaneous blood vessels
  • increased metabolic rate
  • vasoconstriction of coetaneous blood vessels
  • enhanced sweating
  • increased convective loss

Question 4

Question
The thermoregulatory center is located in:
Answer
  • cortex
  • vascular system
  • septal region
  • amygdale
  • hypothalamus

Question 5

Question
What is the normal body temperature?
Answer
  • 81.1°C
  • 36.9°C
  • 98.6°C
  • 21.7°C
  • 39.5°C

Question 6

Question
At which temperature does the excitation of the thermoreceptors begin to cause pain?
Answer
  • at the temperature which causes tissue damage
  • over 45°C
  • at 30°C
  • at 5°C
  • b, and d

Question 7

Question
Heat stroke is characteristically associated with:
Answer
  • profuse sweating
  • elevated basal metabolic rate
  • hot dry skin
  • a and b
  • b and c

Question 8

Question
As ambient temperature increases, heat loss increases by:
Answer
  • radiation
  • convection
  • conduction
  • evaporation
  • none of the above

Question 9

Question
Which of the following is not a function of skin?
Answer
  • respiration
  • excretion
  • sensation
  • thermoregulation
  • protection

Question 10

Question
Following adaptation to a hot climate there is an increase in:
Answer
  • basal metabolic rate
  • heat loss by radiation and convection
  • urinary output
  • the ability to lose heat by sweating
  • decreasing arteriovenous shunting of blood to venous plexus near the surface of the skin

Question 11

Question
Heat - loss mechanisms:
Answer
  • by radiation and convection increase when the ambient temperature decreases
  • by evaporation; depend on the activity of sweat glands being under sympathetic muscarinic control
  • are controlled by the anterior hypothalamus
  • cause an increase in sympathetic tone to skin blood vessels
  • 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
  • 34° C
  • 37° C
  • 20° C
  • 36.3° C
  • 30° C

Question 13

Question
When the temperature of environment is above 34°C, the only heat-loss mechanism is:
Answer
  • convection
  • radiation
  • shivering
  • evaporation
  • radiation and convection

Question 14

Question
The set point level for body temperature is situated in:
Answer
  • anterior hypothalamus
  • skin
  • spinal cord
  • posterior hypothalamus
  • brown mast tissue

Question 15

Question
The most potent mechanism for increasing heat production is:
Answer
  • activation of the parasympathetic nervous system
  • thyroid hormone increasing the metabolic rate
  • shivering
  • radiation
  • decrease in sympathetic tone to skin blood vessels

Question 16

Question
Which of the following is a human thermoregulatory response controlled by cholinergic sympathetics
Answer
  • brown adipose tissue thermogenesis
  • hand vasomotion
  • shivering thermogenesis
  • sweat secretion
  • thermoregulatory behaviour

Question 17

Question
Capability to control body temperture is called
Answer
  • osmoregulation
  • thermoregulation
  • regulation
  • homeostasis

Question 18

Question
what is the result of a rise in body temperture
Answer
  • decrease in the production of sweat
  • an increase in blood flow to the skin
  • narrowing of the blood vessel in the skin
  • raising of ahirs on the skin
  • increase in the production of sweat

Question 19

Question
which response to overcooling does not involve muscle contraction
Answer
  • blood vessel narrowing
  • hairs stand up
  • shivering
  • reduced sweating
  • hyperventilation

Question 20

Question
What happens to the aarterioles near the surface of the skin when the body temperture rises
Answer
  • they absorb oxygen from surrounding tissues
  • they dilute and become wider
  • they move nearer to the surface
  • they take in water from the surrounding tissues
  • they contract
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