Ectotherms

Definition

Ectotherms are organisms that regulate their body temperature primarily through external sources rather than internal metabolic processes. They rely on environmental heat sources to maintain physiological functions.

5 Must Know Facts For Your Next Test

1. Ectotherms include many reptiles such as snakes, lizards, and turtles.
2. Ectotherms often bask in the sun to increase their body temperature and become more active.
3. Unlike endotherms, ectotherms have lower metabolic rates and require less food for energy.
4. Ectothermic animals can be found in a variety of environments, but they are especially common in warmer climates.
5. Temperature regulation in ectotherms affects their behavior, reproduction, and overall survival.

Review Questions

• What is the primary method by which ectotherms regulate their body temperature?
• Name three examples of ectothermic vertebrates.
• How does being an ectotherm affect an animal's metabolic rate?

Related terms

Endotherms:

Organisms that maintain a constant internal body temperature through metabolic activity.

Homeostasis:

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

Thermoregulation:

The process by which organisms control their internal body temperature within certain limits.