Question

multiple select question
select all that apply
choose all that are examples of nonshivering thermogenesis.

• moving into the sun to get warmer
• tiny alternating muscle contractions in antagonistic muscle pairs
• sympathetic mediated increase in metabolic rate
• break down of brown fat

Explanation:

• Nonshivering thermogenesis is heat production without shivering.
• "Moving into the sun to get warmer" is behavioral thermoregulation, not thermogenesis.
• "Tiny alternating muscle contractions in antagonistic muscle pairs" is shivering (shivering thermogenesis).
• "Sympathetic mediated increase in metabolic rate" and "Break down of brown fat" are mechanisms of nonshivering thermogenesis (brown fat metabolism and increased metabolic rate via sympathetic activation are key in nonshivering thermogenesis).

Answer:

• Sympathetic mediated increase in metabolic rate
• Break down of brown fat