Regulation of body temperature in homiotherms during high environmental temperature involve:

Explanation

When the environmental temperature is high, homotherms regulate their body temperature by vasodilation, which involves the widening of blood vessels near the skin's surface. This increases blood flow to the skin, allowing excess heat to be dissipated through radiation and convection, thereby helping to cool the body. Many mammals have erector pili muscles associated with hair follicles. In response to high environmental temperatures, these muscles relax, causing the hairs to lie flat against the skin. This change in the orientation of the hairs reduces the insulating layer of air trapped between the hairs, allowing for more efficient heat dissipation from the skin's surface. Subcutaneous fat acts as insulation, helping to retain body heat. During high environmental temperatures, homotherms may reduce subcutaneous fat through metabolic processes to enhance heat dissipation and prevent overheating. Therefore, all of these mechanisms work together to regulate body temperature in homotherms during high environmental temperatures.