🐭 Metabolic rate


Measuring metabolic rate

Adaptations in organisms with different metabolic rates

Living under low oxygen

Maximum oxygen uptake and fitness in humans


Β 

Measuring metabolic rate

Β 

The sum of all metabolic reactions in the body can be measured as a function of oxygen consumption, carbon dioxide production and heat production. Oxygen is needed in aerobic respiration, carbon dioxide is a byproduct of respiration, while heat is lost energy by many reactions.

The higher these variables, the higher the metabolic rate is. Due to the big range of metabolic rates between organisms at rest versus active, for comparison purposes the resting metabolic rate is obtained.

Β 

Β 

There is a positive correlation between the volume of oxygen used per hour and the body mass of animals. Unsurprising!Β 

Β 

Adaptations in organisms with different metabolic rates

Given that larger animals have accordingly larger metabolic rates, more efficient oxygen delivery is needed to sustain them. Therefore, adaptations in heart chambers, circulation and lungs can be seen in amphibians, reptiles, mammals, birds and fish (excepting lungs in fish)….