How do newborns primarily generate heat to stay warm?

How do newborns primarily generate heat to stay warm?

• A. Shivering
• B. Metabolizing brown fat stores
• C. Decreasing oxygen consumption
• D. Keeping an extended body posture

Answer: (B)

Newborns mainly generate heat through non-shivering thermogenesis in brown adipose tissue. When they’re exposed to cold, the sympathetic system activates brown fat, rich in mitochondria and the protein thermogenin (uncoupling protein 1). This protein uncouples oxidative phosphorylation from ATP production, releasing energy as heat instead of storing it. This rapid heat production is crucial because newborns have little muscle mass for shivering and a high surface area-to-body mass, which makes them prone to heat loss. So metabolizing brown fat stores is the primary way they stay warm. Shivering isn’t a reliable heat source for newborns, decreasing oxygen consumption isn’t how heat is produced, and keeping an extended posture mainly helps conserve heat rather than generate it.

Newborns mainly generate heat through non-shivering thermogenesis in brown adipose tissue. When they’re exposed to cold, the sympathetic system activates brown fat, rich in mitochondria and the protein thermogenin (uncoupling protein 1). This protein uncouples oxidative phosphorylation from ATP production, releasing energy as heat instead of storing it. This rapid heat production is crucial because newborns have little muscle mass for shivering and a high surface area-to-body mass, which makes them prone to heat loss. So metabolizing brown fat stores is the primary way they stay warm. Shivering isn’t a reliable heat source for newborns, decreasing oxygen consumption isn’t how heat is produced, and keeping an extended posture mainly helps conserve heat rather than generate it.