Physiology of temperature regulation: comparative aspects

Area of Science:

• Comparative physiology
• Neuroscience

Background:

• Temperature is a key environmental factor influencing animal energetics and survival.
• Endotherms (mammals, birds) maintain stable body temperature (Tb) via autonomic and behavioral methods.
• Ectotherms (fish, amphibians, reptiles) primarily use behavioral thermoregulation.

Purpose of the Study:

• To review the central nervous system mechanisms of thermoregulation in vertebrates.
• To explore neuromediators and brain regions involved in regulating body temperature.
• To examine thermoregulation under conditions of euthermia, fever, and anapyrexia.

Main Methods:

• Literature review of vertebrate thermoregulation studies.
• Focus on neurobiological mechanisms.
• Comparison across vertebrate groups (endotherms and ectotherms).

Main Results:

• Both endotherms and ectotherms exhibit fever and anapyrexia (regulated hypothermia).
• Fever is a response to pyrogens; anapyrexia is a response to hypoxia.
• Mammalian studies dominate knowledge, but comparative data across vertebrates is essential.

Conclusions:

• Understanding vertebrate thermoregulation requires studying diverse species.
• Neuromediators and central nervous system regions are critical for Tb regulation.
• Fever and anapyrexia are conserved thermoregulatory responses across vertebrates.