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Regulation of Body Temperature- Physiology 2nd year- PMU

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Regulation of Body Temperature- Physiology 2nd year- PMU

Question 1 of 15

1

Thermoreceptors are:

Select one of the following:

  • 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

Explanation

Question 2 of 15

1

The most significant heat source in the body is:

Select one of the following:

  • cellular respiration

  • conductive heat loss

  • convective heat loss

  • evaporation

  • shivering

Explanation

Question 3 of 15

1

A major means for conserving heat is:

Select one of the following:

  • vasodilatation of coetaneous blood vessels

  • increased metabolic rate

  • vasoconstriction of coetaneous blood vessels

  • enhanced sweating

  • increased convective loss

Explanation

Question 4 of 15

1

The thermoregulatory center is located in:

Select one of the following:

  • cortex

  • vascular system

  • septal region

  • amygdale

  • hypothalamus

Explanation

Question 5 of 15

1

What is the normal body temperature?

Select one of the following:

  • 81.1°C

  • 36.9°C

  • 98.6°C

  • 21.7°C

  • 39.5°C

Explanation

Question 6 of 15

1

At which temperature does the excitation of the thermoreceptors begin to cause pain?

Select one of the following:

  • at the temperature which causes tissue damage

  • over 45°C

  • at 30°C

  • at 5°C

  • b, and d

Explanation

Question 7 of 15

1

Heat stroke is characteristically associated with:

Select one of the following:

  • profuse sweating

  • elevated basal metabolic rate

  • hot dry skin

  • a and b

  • b and c

Explanation

Question 8 of 15

1

As ambient temperature increases, heat loss increases by:

Select one of the following:

  • radiation

  • convection

  • conduction

  • evaporation

  • none of the above

Explanation

Question 9 of 15

1

Which of the following is not a function of skin?

Select one of the following:

  • respiration

  • excretion

  • sensation

  • thermoregulation

  • protection

Explanation

Question 10 of 15

1

Following adaptation to a hot climate there is an increase in:

Select one of the following:

  • 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

Explanation

Question 11 of 15

1

Heat - loss mechanisms:

Select one of the following:

  • 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

Explanation

Question 12 of 15

1

The set-point temperature of the hypothalamus, triggering heat - loss or heat - generating mechanisms is:

Select one of the following:

  • 34° C

  • 37° C

  • 20° C

  • 36.3° C

  • 30° C

Explanation

Question 13 of 15

1

When the temperature of environment is above 34°C, the only heat-loss mechanism is:

Select one of the following:

  • convection

  • radiation

  • shivering

  • evaporation

  • radiation and convection

Explanation

Question 14 of 15

1

The set point level for body temperature is situated in:

Select one of the following:

  • anterior hypothalamus

  • skin

  • spinal cord

  • posterior hypothalamus

  • brown mast tissue

Explanation

Question 15 of 15

1

The most potent mechanism for increasing heat production is:

Select one of the following:

  • activation of the parasympathetic nervous system

  • thyroid hormone increasing the metabolic rate

  • shivering

  • radiation

  • decrease in sympathetic tone to skin blood vessels

Explanation

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