When Compared with Ectotherms, Endotherms

Multiple Choice

When compared with ectotherms, endotherms

A) have cells that are more efficient at using energy.
B) have cells that are less leaky to ions.
C) expend less energy to maintain concentration gradients of K⁺ and Na⁺.
D) have cells that have higher metabolic rates.
E) must actively transport more K⁺ out of their cells when at rest.