Question

why does the brain of mammals keep track of the temperature of the skin and the blood?

○ to control the activity level of the animal

○ to regulate breathing rate and heart rate in extreme temperature conditions

○ to guide the animal to warmer or colder locations

○ to maintain a stable body temperature regardless of air temperature

Explanation:

Mammals are endotherms, meaning they maintain a stable internal body temperature (homeothermy). The brain monitors skin and blood temperature to regulate mechanisms (like sweating, shivering, vasodilation/constriction) that keep body temperature constant despite external air temperature changes. Let's analyze the options:

• "to control the activity level of the animal": Activity level is not directly linked to skin/blood temp monitoring for temperature regulation.
• "to regulate breathing rate and heart rate in extreme temperature conditions": While these can be regulated in extreme temps, the primary goal of temperature monitoring is overall thermoregulation (stable body temp), not just extreme - case rate regulation.
• "to guide the animal to warmer or colder locations": Mammals regulate internal temperature, not just move to adjust; this is more for ectotherms or behavioral thermoregulation as a secondary action, not the main reason for brain - based temp tracking.
• "to maintain a stable body temperature regardless of air temperature": This matches endothermic thermoregulation. The brain uses skin (external temp info) and blood (internal temp info) to trigger responses (e.g., shiver if blood too cold, sweat if too hot) to keep body temp stable.

Answer:

D. to maintain a stable body temperature regardless of air temperature