Lower Lethal Body Temperature: For most domestic mammals and birds, the lower lethal core body temperature is within the range of $15^\circ\text{C}$ to $20^\circ\text{C}$.
Hypothermic Arrest: Cooling below $20^\circ\text{C}$ abolishes electrical pacemaking in the SA node, induces intractable ventricular fibrillation, and depresses medullary respiratory neurons to cause fatal cardiopulmonary arrest.
Correct option: (3) 15-20 °C
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ICAR JRF Veterinary Physiology 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Which of the following factor may not affect the set point of body temperature?
Hypothalamic Thermoregulatory Set-Point: Factors that directly alter the hypothalamic set-point temperature include Fever (pyrogens), Hibernation, and Circadian rhythms (sleep/pain).
Feeding Effect: Feeding produces postprandial diet-induced thermogenesis (heat increment of feeding) through digestive and metabolic work, but does NOT alter the central hypothalamic thermostat set-point [Option 4].
Correct option: (4) Feeding
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