Ectotherms

Definition

Ectotherms are organisms that rely on external environmental heat sources to regulate their body temperature. They are often referred to as "cold-blooded" animals and include species like reptiles, amphibians, and fish.

5 Must Know Facts For Your Next Test

1. Ectotherms have lower metabolic rates compared to endotherms.
2. They require less food energy because they do not internally regulate their body temperature.
3. Behavioral adaptations, such as basking in the sun or seeking shade, help ectotherms maintain optimal body temperatures.
4. Ectotherms can be found in a variety of environments, from tropical regions to deserts.
5. Their activity levels are significantly influenced by ambient temperatures.

Review Questions

• What is the primary difference between ectotherms and endotherms?
• How do ectotherms adapt behaviorally to regulate their body temperature?
• Why do ectotherms generally need less food than endotherms?

Related terms

Endotherms: Organisms that generate heat through internal metabolic processes to maintain a stable body temperature.

Homeostasis:

The ability of an organism to maintain consistent internal conditions despite external changes.

Thermoregulation: The process by which organisms control their internal body temperature within certain boundaries.