Standard metabolic rate (SMR)

Definition

Standard Metabolic Rate (SMR) is the metabolic rate of an ectotherm at rest at a specific temperature. It represents the minimum energy expenditure required to maintain vital bodily functions during inactivity.

5 Must Know Facts For Your Next Test

1. SMR is typically measured in a controlled environment with a constant temperature.
2. It is used to compare the metabolic rates of different ectothermic species.
3. Unlike Basal Metabolic Rate (BMR), SMR applies specifically to ectotherms such as reptiles and amphibians.
4. Factors like age, size, and activity level can affect an organism's SMR.
5. SMR provides insights into the energy requirements and ecological strategies of ectotherms.

Review Questions

• What factors can influence an organism's Standard Metabolic Rate?
• How does SMR differ from Basal Metabolic Rate (BMR)?
• Why is SMR important for understanding the physiology of ectotherms?

Related terms

Basal Metabolic Rate (BMR): The metabolic rate of an endotherm at rest in a thermoneutral environment.

Ectotherm: An organism that relies on external sources of body heat.

Thermoregulation: The process by which animals maintain their internal body temperature within certain boundaries.