My BIO 101 book states that when human cells convert glucose to ATP, the process is only approx 35% efficient, and much of the potential energy is lost as heat. However, that heat is useful to us in maintaining our overall body temperature.
Cold-blooded animals (reptiles, for example) are not as effective at maintaining their own body temperature. Does that imply that their cellular metabolism (conversion of glucose to ATP) is more efficient than humans, and thus doesn't produce as much heat?
Or is cold-blooded- / warm-blooded-ness completely unrelated to heat released during cellular metabolism?