Which metabolic consequence arises in a hibernating mammal as ambient temperature nears freezing?

💡 Explanation

As ambient temperature nears freezing during hibernation, non-shivering thermogenesis increases in brown fat because mitochondrial uncoupling produces heat, maintaining core temperature above freezing. Therefore, increased brown fat thermogenesis rate primarily results, rather than decreased glycolysis, elevated glycogenesis, or reduced urea synthesis which are less crucial for immediate survival in cold conditions.

• Which constraint limits prolonged dynamic soaring for seabirds near coastlines with variable winds?
• Which outcome results when the operculum fails to close during a ram ventilation attempt in fish?
• Which risk increases when brown adipose tissue respiration declines during hibernation?
• Which consequence results when owls' feather barbules lack the hooklets found in other birds?
• Which outcome directly arises when pneumatic ducts fail during rapid ascent?
• Why is limiting flight wing loading vital for scavenging birds like vultures during soaring?