Question

1. If someone gains weight around 90 lbs, did their mass-specific metabolism gone up or down?

2. Explain how size and metabolic rate relate to each other?

Answer 1

1) If someone gains weight around 90 lbs,then he will have more muscle mass.So he will burn more calories even at rest.So he will likely to have a faster metabolism.

BMR= 24*Body Weight.

So more the body weight,more is the basal metabolic rate.

2) The organisms having larger body size have a larger metabolic rate because they have larger organs and fluid volume to maintain.Organisms with high meatabolic rates require more efficient delivery of oxygen to cells.

However,BMR is higher per unit mass in small animals compared to larger ones.This is because of greater surface area to volume ratio of their body.So more heat is lost from their body.