All the following can occur in a neonate for heat production except -
Ans. is 'a' i.e., Shivering "Always remember that newborn cannot produce heat by shivering." Thermogenesis in Newborn A newborn is more prone to develop hypothermia because of a large surface area per unit of body weight. o A low bih weight baby has decreased thermal insulation due to reduced subcutaneous and brown fat. Role of Brown fat in thermogenesis o A newborn baby is more prone to develop hypothermia because of large surface area per unit of body weight. o In infants brown fat is an impoant site of thermogenesis. It results in the so called non-shivering thermogenesis. o Brown fat is located around the adrenal glands, kidneys, nape of neck, interscapular and axillary region. o Metabolism of brown fat leads to heat production. o Blood flowing through the brown fat becomes warms and through circulation, transfers heat to other pas of the body. This mechanism of heat production is known as non shivering thermogenesis.
Shivering
Breakdown of brownfat with adrenaline secretion
Universal flexion like a fetus
Cutaneous vasoconstriction